Permian Brachiopods of West Texas, IV (PART 2-PLATES) G. ARTHUR COOPER and RICHARD E. GRANT ?*?**' SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY ? NUMBER 21 <"' K -" ""', S E R I A L P U B L I C A T I O N S O F T H E S M I T H S O N I A N I N S T I T U T I O N The emphasis upon publications as a means of diffusing knowledge was expressed by the first Secretary of the Smithsonian Institution. In his formal plan for the Insti? tution, Joseph Henry articulated a program that included the following statement: "I t is proposed to publish a series of reports, giving an account of the new discoveries in science, and of the changes made from year to year in all branches of knowledge." This keynote of basic research has been adhered to over the years in the issuance of thousands of titles in serial publications under the Smithsonian imprint, com? mencing with Smithsonian Contributions to Knowledge in 1848 and continuing with the following active series: Smithsonian Annals of Flight Smithsonian Contributions to Anthropology Smithsonian Contributions to Astrophysics Smithsonian Contributions to Botany Smithsonian Contributions to the Earth Sciences Smithsonian Contributions to Paleobiology Smithsonian Contributions to Zoology Smithsonian Studies in History and Technology In these series, the Institution publishes original articles and monographs dealing with the research and collections of its several museums and offices and of professional colleagues at other institutions of learning. These papers report newly acquired facts, synoptic interpretations of data, or original theory in specialized fields. These pub? lications are distributed by mailing lists to libraries, laboratories, and other interested institutions and specialists throughout the world. Individual copies may be obtained from the Smithsonian Institution Press as long as stocks are available. S. DILLON RIPLEY Secretary Smithsonian Institution S M I T H S O N I A N C O N T R I B U T I O N S T O P A L E O B I O L O G Y ? N U M B E R 21 Permian Brachiopods of West Texas, IV (PART 2-PLATES) G. Arthur Cooper and Richard E. Grant ISSUED FEB 1 2 1978 SMITHSONIAN INSTITUTION PRESS City of Washington 1976 Contents PLATES Page 503. Petasmatherus and Tricoria 2289 504. Elassonia, Leiorhynchoidea, Aphaurosia, and Paranorella 2291 505. Ptygmactrum and Fascicosta 2293 506. Trophisina 2295 507. Chaeniorhynchus, Deltarina, and Tricoria 2297 508. Pontisia, Strigirhynchia, Deltarina, Bryorhynchus, Phrenophoria, Chaeniorhynchus, Lirellaria, Ptilotorhynchus, and Cenorhynchia 2299 509. Divaricosta, Fascicosta, and Allorhynchus 2301 510. Strigirhynchia, Paranorella, Pontisia, Cenorhynchia, Bryorhynchus, Anteridocus, and Cleiothyridina 2303 511. Lirellaria and Aphaurosia 2305 512. Amphipella and Acolosia 2307 513. Ptilotorhynchus, Iotina, Acolosia, and Madarosia . . 2309 514. Strigirhynchia and Phrenophoria 2311 515. Cenorhynchia, Acolosia?, Aphaurosia, Wellerella, Anteridocus, Phrenophoria, Po?itisia, and Tautosia 2313 516. Pontisia and Phrenophoria 2315 517. Antronaria, Anteridocus, Cenorhynchia, Phrenophoria, Pontisia, and Madarosia . . . . 2317 518. Phrenophoria 2319 519. Phrenophoria, Tautosia, Cenorhynchia, and Holosia 2321 520. Cenorhynchia, Pontisia, Leiorhynchoidea, Anteridocus, Strigirhynchia, and Ptygmactrum 2323 521. Phrenophoria, Petasmatherus, Tautosia, Fascicosta, Anteridocus, Aphaurosia, Cenorhynchia, and Strigirhynchia 2325 522. Phrenophoria 2327 523. Phrenophoria, Holosia, and Tautosia 2329 524. Tautosia and Phrenophoria 2331 525. Tautosia, Phrenophoria, and Acolosia 2333 526. Tautosia 2335 527. Tautosia and Wellerella 2337 528. Wellerella 2339 529. Anteridocus, Pontisia, and Antronaria 2341 530. Antronaria and Pontisia 2343 531. Antronaria and Pontisia 2345 532. Antronaria 2347 533. Antronaria and Pontisia 2349 534. Anteridocus and Pontisia 2351 535. Anteridocus, Antronaria, and Pontisia 2353 536. Antronaria and Pontisia 2355 537. Antronaria 2357 538. Antronaria and Anteridocus 2359 539. Hemileurus and Anteridocus 2361 540. Anteridocus, Petasmatherus, and Allorhynchus 2363 541. Allorhynchus, Petasmatherus, and Phrenophoria 2365 542. Allorhynchus 2367 543. Allorhynchus and Cenorhynchia 2369 544. Cenorhynchia and Tautosia 2371 545. Cenorhynchia 2373 546. Cenorhynchia and Bryorhynchus 2375 547. Cenorhynchia and Bryorhynchus 2377 iii IV SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY Page 548. Bryorhynchus, Leiorhynchoidea, and Madarosia 2379 549. Leiorhynchoidea 2381 550. Leiorhynchoidea and Bryorhynchus 2383 551. Paranorella, Petasmatherus, and Anteridocus 2385 552. Aphaurosia, Divaricosta, Cenorhynchia, Pontisia, Ptilotorhynchus, Phrenophoria, Deltarina, Antronaria, Fascicosta, and Madarosia 2387 553. Phrenophoria, Stenoscisma, Wellerella, and Tautosia 2389 554. Stenoscisma 2391 555. Stenoscisma 2393 556. Stenoscisma 2395 557. Stenoscisma 2397 558. Stenoscisma 2399 559. Stenoscisma 2401 560. Stenoscisma 2403 561. Stenoscisma 2405 562. Stenoscisma 2407 563. Stenoscisma 2409 564. Stenoscisma 2411 565. Stenoscisma 2413 566. Stenoscisma 2415 567. Stenoscisma 2417 568. Stenoscisma 2419 569. Stenoscisma 2421 570. Stenoscisma 2423 571. Stenoscisma 2425 572. Stenoscisma 2427 573. Stenoscisma 2429 574. Stenoscisma 2431 575. Stenoscisma 2433 576. Stenoscisma 2435 577. Stenoscisma 2437 578. Stenoscisma 2439 579. Stenoscisma 2441 580. Stenoscisma 2443 581. Stenoscisma 2445 582. Stenoscisma 2447 583. Stenoscisma 2449 584. Torynechus 2451 585. Torynechus 2453 586. Psilocamara and Torynechus 2455 587. Xenosaria, Crurithyris, and Grandaurispina 2457 588. Crurithyris 2459 589. Crurithyris 2461 590. Crurithyris and Attenuatella 2463 591. Gypospirifer 2465 592. Gypospirifer and Neospirifer 2467 593. Neospirifer and Gypospirifer 2469 594. Neospirifer 2471 595. Neospirifer 2473 596. Neospirifer 2475 597. Neospirifer 2477 598. Neospirifer 2479 599. Neospirifer 2481 600. Neospirifer 2483 601. Neospirifer and Gypospirifer 2485 602. Neospirifer and Gypospirifer 2487 603. Neospirifer 2489 604. Neospirifer 2489 NUMBER 21 Page 605. Neospirifer 2493 606. Neospirifer 2495 607. Neospirifer 2497 608. Neospirifer 2499 609. Neospirifer 2501 610. Neospirifer 2503 611. Neospirifer 2505 612. Neospirifer 2507 613. Cartorhium 2509 614. Cartorhium 2511 615. Cartorhium 2513 616. Cartorhium 2515 617. Cartorhium 2517 618. Cartorhium 2519 619. Cartorhium 2521 620. Cartorhium 2523 621. Lepidospirifer 2525 622. Lepidospirifer 2527 623. Lepidospirifer 2529 624. Cartorhium and Lepidospirifer 2531 625. Spiriferinaella 2533 626. Spiriferinaella, Eridmatus, and Spiriferella 2535 627. Spiriferella 2537 628. Spiriferella 2539 629. Spiriferella 2541 630. Spiriferella 2543 631. Spiriferella and Martinia 2545 632. Eliva 2547 633. Elivina, Rallacosta, and Eliva 2549 634. Elivina 2551 635. Neophricadothyris 2553 636. Neophricadothyris 2555 637. Neophricadothyris 2557 638. Neophricadothyris 2559 639. Neophricadothyris 2561 640. Anomaloria 2563 641. Astegosia 2565 642. Astegosia 2567 643. Martinia 2569 644. Martinia 2571 645. Martinia 2573 646. Rallacosta and Heteraria 2575 647. Rallacosta 2577 648. Rallacosta 2579 649. Martinia, Neophricadothyris, Astegosia, and Anomaloria 2581 650. Cleiothyridina 2583 651. Cleiothyridina and Nucleospira 2585 652. Composita 2587 653. Composita 2589 654. Composita 2591 655. Composita 2593 656. Composita 2595 657. Composita 2597 658. Composita 2599 659. Composita 2601 660. Composita 2603 661. Composita 2605 662. Composita 2607 PLATES 503-662 2288 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 503 Petasmatherus and Tricoria Petasmatherus opulus, Cooper and Grant: 1, Anterior, posterior, side, ventral, and dorsal views of a complete specimen, X2, hypotype USNM 148307c. [Word Formation (China Tank Member), USNM 706c] 2, Anterior, dorsal, posterior, ventral, side, and dorsal views of complete specimen, X2, (dorsal, X 1), hypotype USNM 148302f. [Word Formation (Willis Ranch Member), USNM 706.] 3, Anterior, dorsal, XI, posterior, ventral, side, and dorsal views of complete specimen, X2, hypotype USNM 154609. [Cherry Canyon Formation (Getaway Member), AMNH 496.] 4, Dorsal, anterior, side, posterior, and ventral views, X2, and dorsal view, XI, paratype USNM 148305b; 5, ventral, anterior, side, posterior, and ventral views, X2, and dorsal view, XI, holo? type USNM 148305a; 6, specimen with pedicle beak broken away to show crura, X3, hypotype USNM 148305g; 7, interior of pedicle valve, showing well developed interarea, X3, hypotype USNM 148305h; 8, 9, ventral and laterally tilted views of interior, X3, showing cardinalia, hypotype USNM 148305i; 10, 11, laterally and anteriorly tilted views of preceding specimen, X6, showing median ridge, cardinalia, and dental plates; 12, 13, anteriorly tilted and ventral views of interior, X6, showing cardinalia, paratype USNM 148305f; 14, anterior view of cardi? nalia, X6, hypotype USNM 148305J; 15, side view, showing crura, X6, hypotype USNM 148305k; 16, interior of brachial valve, showing cardinalia, X3, hypotype USNM 148305-1; 17-19, laterally tilted, X3, X6, and interior, X6, views of brachial valve, paratype USNM 148305e; 20, side view, showing crura and interarea, X6, hypotype USNM 148305m. [Word Formation (lens between Willis Ranch and Appel Ranch members), USNM 706b.] Petasmatherus recticardinatus, new species: 21, Posterior, anterior, side, ventral, and dorsal views, X2, of holotype USNM 152824. [Cherry Canyon Formation (Getaway Member), AMNH 512.] Petasmatherus cf. P. opulus, Cooper and Grant: 22, Posterior, anterior, side, ventral, and dorsal views, X2, complete specimen USNM 148310. [Road Canyon Formation, USNM 703d.] Petasmatherus depressus, new species: 23, Posterior, anterior, side, ventral, and dorsal views, X2, complete holotype USNM 154614. [Road Canyon Formation, USNM 721j.] Tricoria hirpex, new species: 24-26, Dorsal, posterior, side, anterior, and ventral views of three immature, complete specimens, showing narrow form, XI, paratypes USNM 148155b, c, d; 27, dorsal, posterior, side, anterior, and ventral views, X] , of a complete specimen, paratype USNM 148155f; 28, 29, dorsal, posterior, side, anterior, and ventral views, XI, immature paratypes USNM 148155h, i; 30, dorsal, posterior, side, anterior, and ventral views, XI, adult paratype USNM 148155J; 31, dorsal, posterior, side, anterior, and ventral views, XI, adult paratype USNM 148155k (for enlarged views, see Plate 507: figures 69-71); 32-34, anterior, interior, and laterally tilted views, X2, of a brachial valve, showing cardinalia and median septum, paratype USNM 148155-1; 35, 36, ventral and laterally tilted views of the preceding, X4, showing the cardinalia in greater detail; 37, interior of a pedicle valve, XI, paratype USNM 148155m; 38, 39, laterally tilted and interior views of specimen with ventral valve partly broken away, showing the cardinalia, X2, paratype USNM 148155p; 40, 41, same views as preceding, X4, showing cardinalia in more detail. [Skinner Ranch Formation (base), USNM 705a.] NUMBER 21 2289 PLATE 503.?Petasmatherus and Tricoria. # " # 24 25 26 27 ft i^ RK-- ? ? ? > 4T* # 28 29 30 31 Kl A* <$fc n^ ? . A ?w r A 2290 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 504 Elassonia, Leiorhynchoidea, Aphaurosia, and Paranorella Elassonia micraria, new species: 1, Dorsal views of four specimens, XI, from left, paratypes USNM 154620a, b, c, and holotype USNM 154620d; 2, 3, dorsal, posterior, side, anterior, and ventral views, X3, paratypes USNM 154620a, b; 4, 6, dorsal, posterior, side, anterior, and ventral views, X3, and dorsal view, X6, paratype USNM 154620c; 5, 7, dorsal, posterior, side, anterior, and ventral views, X3, and dorsal view, X6, holotype USNM 154620d; 8, side view showing interarea and crura, X12, paratype USNM 154620e; 9, anterior view, X12, showing median ridge and crura, paratype USNM 154620f; 10, interior of pedicle valve, X12, paratype USNM 154620g; II, interior of pedicle valve tilted to show dental plates, X12, paratype USNM 154620h; 12, 13, interior and interior tilted to show cardinalia, X12, paratype USNM 154620i; 14, interior of brachial valve, X 12, showing long crura, paratype USNM 154620J; 15, 16, interior and interior tilted of ladge brachial valve, X12, showing long slender crura, paratype USNM 154620k. [Road Canyon Formation, USNM 702c] Elassonia petila, new species: 17, ventral, posterior, side, anterior, and dorsal (also XI) views, X3, holotype USNM 148255a; 18, ventral, posterior, side, and dorsal (also XI) views, X3, para? type USNM 148255b, and brachial and pedicle valve interiors, X3, paratypes USNM 148255e, f; 19, 20, interior views of brachial and pedicle valves, X12, paratypes USNM 148255e, f. [Cathedral Mountain Formation, USNM 702.] Elassonia scitula, new species: 21, Dorsal, posterior, side, anterior, and ventral views, X3, and dorsal view, XI, holotype USNM 148261b; 22, Dorsal view of holotype, X4; 23, dorsal, posterior, side, anterior, and ventral views, XI, paratype USNM 148261a; 24, dorsal view of the preceding, X4; 25, interior of pedicle valve, X12, paratype USNM 148260a; 26, 27, interior of brachial valve showing cardinalia, X3 and X12, paratype USNM 148260b; 28, interior of brachial valve, X12, paratype USNM 148260c. [Cathedral Mountain Formation, USNM 708u.] Elassonia sobrina, new species: 29, 30, Ventral, posterior, side, anterior, and dorsal views, X3, dorsal views, XI, and X4, of holotype USNM 148251a; 31, dorsal view of small paratype, X4, USNM 148251b; 32, interior of brachial valve, X15, paratype USNM 14825U1; 33, interior of brachial valve, X15, paratype USNM 148251c [Hess Formation (Taylor Ranch Member), USNM 702d.] Leiorhynchoidea sulcata, new species: 34-36, Dorsal, anterior, and side views of robust specimen, XI, holotype USNM 155054. [Cherry Canyon Formation (South Wells Member), AMNH 414.] Aphaurosia rolundala, new species: 37-39, Dorsal, side, and anterior views of complete specimen, X2, paratype USNM 154509a; 40-42, side, anterior, and dorsal views of complete specimen, X2, paratype USNM 154509b; 50, ventral, posterior, side, anterior, and dorsal views, XI, of the preceding; 43-45, side, dorsal, and anterior views of rotund specimen, XI, paratype USNM 154509c; 46-48, dorsal, side, and anterior views of large complete specimen, X2, holotype USNM I54509d; 49, ventral, posterior, side, anterior, and dorsal views, XI, of holotype; 51, dorsal view of specimen minus most of its pedicle valve, showing dorsal side of crura, X2, paratype USNM 154509c; 52, interior of brachial valve, X2, paratype USNM 154509f; 53, interior of brachial valve showing cardinalia, X2, paratype USNM 154509g; 54, interior of pedicle valve, X2, para? type USNM 154509b. [Bell Canyon Formation (Lamar Member), USNM 728p.] Paranorella species 5: 55, 56, Interior of brachial valve, XI, X3, showing the leiorhynchoid cardinalia and long median septum, figured specimen 152872a; 57, interior of pedicle valve, XI, figured specimen USNM 152872b; 58, 59, posterior parts of two brachial valves showing hinge plate and median septum, X2, figured specimens USNM 152872c, d; 60, interior of pedicle valve, X2, showing short dental plates and teeth, figured specimen USNM 152872c. [Road Canyon Formation, USNM 726d.] NUMBER 21 2291 PLATE 504.?Elassonia, Leiorhynchoidea, Aphaurosia, and Paranorella. ? m ^*?# 19 20 * i % ?Q $ f^ 21 23

41 37 40 V f 44 38 45 T* 42 48 46 47 ': $ 39 ? ^ 51 t 7 52 53 50 49 54 2292 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 505 Ptygmactrum and Fascicosta Ptygmactrum angulatum, new species: 1, 2, Interior of pedicle valve, X3, X9, showing teeth, paratype USNM 148316c; 3, dorsal and ventral views, X3, of a complete specimen, paratype USNM 148316d; 6, ventral, anterior, side, posterior, and dorsal views, X3, and dorsal view, XI, paratype USNM 148316a; 7, 8, ventral, anterior, side, posterior, and dorsal views, X3, dorsal view, XI, and dorsal view, X6, paratype USNM 148316b. [Cathedral Mountain Formation, USNM 702b.] 4, 5, Dorsal, anterior, side, and ventral views, X3, and dorsal view, X6, paratype USNM 154622; 21-25, ventral, posterior, anterior, side, and dorsal views, X4, holotype USNM 148317. [Cathedral Mountain Formation, USNM 703bs.] 9, Interior of brachial valve, X4, showing the cardinalia, paratype USNM 148318. [Cathedral Mountain Formation, USNM 708u.] Ptygmactrum acutum, new species: 10, Posterior, dorsal, XI, anterior, dorsal, side, and ventral views, holotype USNM 154623, X3; 11, dorsal view, X6, of the holotype, showing spines on costae. [Road Canyon Formation, USNM 720d.] Fascicosta bella, new species: 12-15, Dorsal view, XI, and anterior, dorsal, and side views, X2, holotype USNM 154621. [Bell Canyon Formation (Rader Member), USNM 725g.] Ptygmactrum depressum, new species: 16, Anterior, dorsal, XI, posterior, dorsal, side, and ventral views, X3, paratype USNM 152861. [Road Canyon Formation, USNM 721j.] 17, 18, Anterior, side, posterior, ventral, dorsal, XI, and dorsal views, X3, and dorsal view, X6, holotype USNM 148319. [Road Canyon Formation, USNM 7l6xa.] Ptygmactrum mordicum, new species: 19, Anterior, posterior, side, ventral, and dorsal views, X3, holotype USNM 148315a; 20, interior of the brachial valve, X6, showing the cardinalia, para? type USNM 148315b. [Cathedral Mountain Formation, USNM 702.] Ptygmactrum spiculatum, new species: 26, Dorsal view of a complete specimen, X3, paratype USNM 148323a; 30, interior of a brachial valve, X6, paratype USNM 148323b. [Word Formation (lens between Willis Ranch and Appel Ranch members), USNM 706b.] 27, 28, Anterior, dorsal, XI, posterior, ventral, side, and dorsal views, X3, and dorsal view, X6, holotype USNM 152862a; 29, interior of the pedicle valve, X6, paratype USNM 152862b. [Cherry Canyon Formation (Getaway Member), AMNH 512.] Ptygmactrum extensum, new species: 31-36, Posterior, anterior, ventral, side, and dorsal views, X4, and dorsal view, XI, paratype USNM 148321a; 37-42, side, anterior, ventral, dorsal, and posterior views, X4, and dorsal view, XI, holotype USNM 148321b; 43, 44, dorsal view, XI, X3, of a complete specimen, paratype USNM 148321c (see Plate 520: figures 40-44 for additional enlarged views) ; 45-47, dorsal view, XI, and ventral and dorsal views, X3, of another complete specimen, paratype USNM 148321d; 48, 49, interior of a brachial valve, XI, X8, showing cardinalia and median septum, paratype USNM 148321c [Road Canyon Formation, USNM 703d.] 50, Dorsal view of a complete specimen, X3, paratype USNM 148320; 51, 52, interior of the pedicle valve, and the same tilted to show the dental plates, X3, of the preceding specimen; 53, interior of the brachial valve of the same specimen, X3; 54, 55, interior of the pedicle valve of the preceding specimen, X9, X16, showing dental plates, teeth and interarea; 56, 57, interior of the same brachial valve lilted, X3 and X9, showing the cardinalia and small median ridge; 58, interior of the same brachial valve showing the cardinalia, X9. [Road Canyon Formation, USNM 703cl NUMBER 21 2293 PLATE 505.?Ptygmactrum and Fascicosta. ^##1^* * !^ 4b **P> i m* ^ 4^i fo 20 19 4lfe 22 %AAV< 23 24 25 # l# 2 2 9 4 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 506 Trophisina Trophisina fenaria, new species: 1, 2, Ventral, anterior, side, posterior, and dorsal views of two complete paratypes, XI, USNM 148242a, b. [Cathedral Mountain Formation, USNM 702-low.] 3, Ventral, posterior, side, anterior, and dorsal views, XI, of a young adult, paratype USNM 148236J; 4, 5, ventral, anterior, side, posterior, and dorsal views of two triangular, immature individuals, XI, paratypes USNM 148236f, g (see also figure 9) ; 6, ventral, anterior, side, pos? terior, and dorsal veiws of a paratype slightly more mature than the preceding, XI, USNM 148236i; 8, 20, enlargements, X5, of the beak region, showing foramen and disjunct deltidial plates, and tilted to show the dental plates, paratype USNM 148236m; 10, series of immature brachial valves, X4, showing development of the cardinalia, paratypes USNM 148238a-f; 11, dorsal view of an immature complete specimen, X3, paratype USNM 148236k; 19, interior of an immature pedicle valve, X3, paratype USNM 148236-1; 23, 24, interior of an immature brachial valve, X3, X6, showing the cardinalia and absence of a median ridge, paratype USNM 148236n; 25, 26, interior of a nearly adult brachial valve, X3, X6, showing cardinalia and divided hinge plate, paratype USNM 148236o; 28, anterior view of the interior, X3, showing the long, slender crura, paratype USNM 148236p; 29, ventral view of the complete hinge plate, X8, para? type USNM 148236q; 36-38, tilted, slightly tilted, and anterior views of a specimen with both valves, X6, showing the dental plates, cardinalia, median ridge, and hinge plate nearly com? plete, paratype USNM 148236s; 39, interior of a young adult brachial valve having an incomplete hinge plate, X3, paratype USNM 148236t. [Cathedral Mountain Formation, USNM 703b.] 7, Ventral, anterior, side, posterior, and dorsal views of a young adult, XI, paratype USNM 148224a; 9, series of immature individuals, X3, smallest four are paratypes USNM 154640a-d, last is paratype USNM 148236g (see figure 5); 12-17, dorsal view, XI, and posterior, side, anterior, dorsal, and ventral views, X2, of the holotype USNM 148225; 18, interior of immature pedicle and brachial valves, X3, paratypes USNM 154640c, f; 21, posterior of a specimen from which the brachial valve has been removed, in dorsal view, X5, showing the underside of a complete hinge plate, paratype USNM I54640g; 22, posterior of a pedicle valve, X5, showing disjunct deltidial plates, paratype USNM 154640h; 27, posterior of the pedicle valve, X5, tilted to show disjunct deltidial plates and dental plates, paratype USNM I54640i; 30, interior of an adult brachial valve with fused hinge plate, X6, paratype USNM 154640J; 31, 32, dorsal and posterior views, X3, of a brachial valve with hinge plate still divided, X3, paratype USNM 154640k; 33, anterior view of the preceding specimen, X6, showing median ridge and long crura; 34, 35, interior of another brachial valve, X3, showing cardinalia and muscle scars, and the same specimen in posterior view, X6, showing the nearly complete hinge plate and long crura, paratype USNM 154640-1; 40, anterior view of * specimen with parts of both valves, X3, showing dental plates and crura, paratype USNM 154640m; 41, another specimen preserved like the preceding, X3, and showing long crura, paratype USNM 154640n; 42, tilted anterior view of a specimen, X2, with side broken to show the crura, paratype USNM 154640o. [Cathedral Mountain Formation, USNM 702un.] NUMBER 21 2295 PLATE 506.?Trophisina. 2 2 9 6 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 507 Chaeniorhynchus, Deltarina, and Tricoria Chaeniorhynchus inauris, new species: 1-5, Ventral, posterior, side, anterior, and dorsal views, XI, of the holotype USNM 148784a; 6-8, ventral, side, and anterior views, X2, of the holotype. [Cathedral Mountain Formation, USNM 702-low.] 9-13, Dorsal, posterior, anterior, ventral, and side views of a complete specimen, XI, paratype USNM 148520a; 14, ventral view of a specimen with beak broken away to show the crura, X2, paratype USNM 154654a; 15, 16, interior and tilted views of a brachial valve, X2, showing the hinge plate, paratype USNM 154654c; 17, 18, interior of another brachial valve, X2, X4, showing the hinge plate and median septum, paratype USNM 154654b; 19, interior of a young pedicle valve having no deltidial plates, X2, paratype USNM 154654e; 20, anterior view of the interior, X6, showing the median septa and crura, paratype USNM 148520b. [Cathedral Mountain Formation, USNM 702.] Chaeniorhynchus salulare, new species: 21-25, Ventral, posterior, anterior, dorsal, and side views of the holotype, XI, USNM 148522a; 26-28, dorsal, side, and anterior views, X2, of the holotype; 29, 30, interior of the pedicle valve, XI, X2, tilted to show the dental plates, paratype USNM 154653g; 31, interior of the brachial valve, X2, paratype USNM 154653b. [Road Canyon Forma? tion, USNM 703a.] Deltarina magnicostata, new species: 32, 33, Dorsal, posterior, side, anterior, and ventral views, XI, of two immature paratypes USNM 154651a, b; 34, dorsal, posterior, side, anterior, and ven? tral views, XI, of an adult individual, paratype USNM 152815d; 35-37, anterior, side, and dorsal views of the preceding specimen, X2; 38, dorsal, posterior, side, anterior, and ventral views of a young adult, XI, paratype USNM 154651b; 39, dorsal, posterior, side, anterior, and ventral views, XI, of the holotype USNM 154651c; 40-42, side, anterior, and dorsal views, X2, of the holotype; 43, 44, brachial valve tilted and in interior view, X3, showing cardinalia, para? type USNM 154651f; 46, 47, interior of the pedicle valve, X3, X1.5, showing interarea, paratype USNM 154651d; 48, side view of a specimen from which the pedicle beak has been broken to show the crura, X3, paratype USNM 154651c [Bell Canyon Formation (Lamar Member), USNM 725c] 45, Interior of a brachial valve, X3, showing cardinalia, paratype USNM 154656h; 49, 50, interior of two pedicle valves, X1.5, paratypes USNM 154656a, b; 51, 56, interior of the pedicle valve, XI.5, X3, showing teeth and main pallial trunks, paratype USNM 154656c; 52, interior of another pedicle valve, X1.5, paratype USNM 154656d; 53, anterior view, X3, showing cardi? nalia and dental plates, paratype USNM 154656e; 54, posterior of the brachial valve, X6, showing the cardinalia, paratype USNM 154656i; 55, posterior of another brachial valve, X6, showing the cardinalia, paratype USNM 154656g. [Bell Canyon Formation (Lamar Member) , USNM 738.] Tricoria hirpex, new species: 57-61, Anterior, posterior, ventral, side, and dorsal views, XI, holotype USNM 154652; 62, 63, interior of the pedicle valve of the holotype, X2, showing muscle scars; 64, 65, interior of the brachial valve of the holotype, X2, showing cardinalia; 66, 67, the two preceding views enlarged, X4, showing cardinalia and crura in detail; 68, interior of a pedicle valve, X4, showing pallial marks, paratype USNM 148155m; 69-71, anterior, side, and dorsal views of a complete specimen, X2, paratype USNM 148155J (for natural size views, see Plate 503: figure 31). [Skinner Ranch Formation (base), USNM 705a.] NUMBER 21 2297 PLATE 507.?Chaeniorhynchus, Deltarina, and Tricoria 2 2 9 8 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 508 Pontisia, Strigirhynchia, Deltarina, Phrenophoria, Bryorhynchus, Chaeniorhynchus, Lirellaria, Cenorhynchia, and Ptilotorhynchus Pontisia robusta, new species: 1-5, Ventral, posterior, side, anterior, and dorsal views of a com? plete specimen, XI, holotype USNM 154664a. [Cibolo Formation (Breccia Zone of Udden), USNM 728-1.] Strigirhynchia indentata (Shumard): 6-10, Dorsal, anterior, ventral, side, and posterior views, XI, of a young specimen, hypotype USNM 148530a; 11, 12, dorsal and side views of the preced? ing specimen, X2. [Capitan Formation, USNM 737a.] 13-17, Dorsal, anterior, side, posterior, and ventral views of a small, complete specimen, XI, hypotype USNM 154659a; 18-20, anterior, dorsal, and side views, X2, of the preceding specimen. [Capitan Formation USGS 7404.] 21-23, Dorsal, anterior and side views, X2, of a complete specimen, hypotype USNM 154661a. [Capitan Formation, USNM 725-1.] 24-28, Posterior, ventral, side, dorsal, and anterior views of a silicified specimen, XI, hypotype USNM 154660. [Bell Canyon Formation (Lamar Member), USNM 728p.] 29, Interior of a brachial valve, X3, showing an undivided hinge plate, hypotype USNM 148531. [Bell Canyon Formation (Lamar Member), USNM 728p.] Deltarina magnicostata, new species: 30-33, Anterior, side, and dorsal views, XI, and dorsal view, X2, paratype USNM 154658. [Bell Canyon Formation (Lamar Member) USNM 728p.] Phrenophoria perplexa, new species: 34-39, Dorsal, posterior, side, ventral, and anterior views, XI, and dorsal view, XI.5, paratype USNM 154665a. [Bell Canyon Formation (Rader Member) , USNM 740a.] Bryorhynchus bisulcatum (Shumard) : 40-43, Posterior, ventral, dorsal, and anterior views of an anteriorly costate individual, XI, hypotype USNM 154931a; 44-47, ventral, anterior, dorsal, and posterior views of another hypotype with strong costae, XI, USNM 154931b. [Bell Canyon For? mation (Rader Member), USNM 740j.] Chaeniorhynchus transversum, new species: 48-55, Anterior, dorsal, posterior, side, and ventral views, XI, and dorsal, side, and anterior views, X2, holotype USNM 148523. [Cathedral Moun? tain Formation, USNM 703b.] Lirellaria costellata, new species: 56, Posterior, anterior, side, ventral, and dorsal views of a complete specimen, XI, paratype USNM 154667; 57-60, dorsal view, XI, and anterior, dorsal, and side views, X2, holotype USNM 155073a; 61-64, dorsal view, XI, and anterior, side, and dorsal views, X2, paratype USNM 155073b. [Bell Canyon Formation (Lamar Member) , USNM 728p.] Cenorhynchia saginata, new species: 65-67, Anterior, side and dorsal views of a complete speci? men, X2, paratype USNM 154666a. [Cibolo Formation (thin-bedded zone], USNM 738-1.] Phrenophoria species 3: 68-70, Exterior, interior, and interior laterally tilted views of the brachial valve, XI, figured specimen USNM 154663; 71, interior of the preceding specimen, X4, showing undivided hinge plate. [Road Canyon Formation, USNM 721 j.] Ptilotorhynchus delicatum, new species: 72, 73, Posterior and dorsal views of a young specimen with a reflected lip on the deltidium, X4, paratype USNM 154668a; 74, 75, posterior, and dorsal views of another young specimen with labiate foramen, X4, paratype USNM 154668b. [Bell Canyon Formation (Lamar Member) , USNM 728p.] 76, Dorsal view of another, elongate, young specimen having a labiate foramen, X6, paratype USNM 154670. [Bell Canyon Formation (Lamar Member), USNM 738b.] NUMBER 21 2299 PLATE 508.?Pontisia, Strigirhynchia, Deltarina, Phrenophoria, Bryorhynchus, Chaeniorhynchus, Lirellaria, Cenorhynchia, and Ptilotorhynchus. 2 3 0 0 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 509 Divaricosta, Fascicosta, and Allorhynchus Divaricosta squarrosa Cooper and Grant: 1-5, Anterior, posterior, ventral, side, and dorsal views, XI, lectotype AMNH 27904/1; 6-8, dorsal, side, and anterior views of the preceding lectotype, X2; 9, dorsal, posterior, side, anterior, and ventral views, XI, of another complete specimen, paratype AMNH 27904/2; 10, 11, interior of the pedicle valve, X1.5, and posterior of same specimen, X3, paratype AMNH 27904/4; 12-15, exterior, interior, and interior tilted views, and posterior, X3, of a pedicle valve, showing the deltidium, teeth, and dental plates, hypotype USNM 154675a; 16, interior of another pedicle valve, X2, hypotype USNM 154675b; 17, interior of a brachial valve, XI.5, showing hinge plate, paratype AMNH 27904/6; 18-20, laterally tilted and interior views of the brachial valve, X4, and cardinalia with undivided hinge plate, X6, of another brachial valve, hypotype USNM 154675c; 21, 22, interior of the pedicle and brachial valves of a small individual, XI, hypotype USNM 148221; 23, interior of the pedicle valve of the preceding specimen enlarged, X3; 24-26, interior, posteriorly tilted, and laterally tilted views of the preceding brachial valve, X3, showing divided hinge plate and long crura. [Cherry Canyon Formation (Getaway Member), AMNH 512 = USNM 728.] Fascicosta longaeva (Girty): 27-32, Posterior, anterior, side, ventral, and dorsal views, XI, and dorsal view, X2, of the lectotype USNM 118573a. [Capitan Formation, USGS 2926 (green).] 33-40, Anterior, posterior, side, ventral, and dorsal views, XI, and anterior, side, and dorsal views, X2, of a complete specimen, hypotype USNM 152816a; 41-48, anterior, dorsal, ventral, side, and posterior views, XI, and dorsal, side, and anterior views, X2, of another complete specimen, hypotype USNM 152816b. [Capitan Formation, USNM 750b.] 49-53, Posterior, side, dorsal, ventral, and anterior views, XI, of a complete specimen, hypo? type USNM 148247a. [Capitan Formation, USNM 737a.] 54, 55, Interior of the brachial valve, X3, showing a divided hinge plate and tilted to show the median septum, hypotype USNM 148246. [Bell Canyon Formation (Pinery Member), USNM 736.] 56-59, Specimen with brachial valve broken away and showing the under side of the crura, XI, and the same view, X2, hypotype USNM 154677. [Bell Canyon Formation (Lamar Mem? ber), USNM 738.] Divaricosta vagabunda, new species: 60, 61, Dorsal and ventral views, XI, and dorsal view, X2, holotype USNM 154674. [Word Formation (Appel Ranch Member), USNM 719z.] Fascicosta elongata, new species: 62, Dorsal, posterior, side, anterior, and ventral views, XI, of a complete specimen, holotype USNM 152817; 63-67, dorsal, ventral, posterior, anterior, and side views of the preceding specimen, X2. [Bell Canyon Formation (Pinery Member), AMNH 33.] Fascicosta bella, new species: 68, Dorsal, posterior, side, anterior, and ventral views, XI, of a complete specimen, paratype USNM 154679; 69-73, Anterior, side, ventral, posterior, and dorsal views, X2, of the same paratype. [Bell Canyon Formation (Rader Member), AMNH 410.] Allorhynclius concentricum, new species: 74-77, Anterior, dorsal, side views, XI, and dorsal view, X2, figured specimen USNM 154676. [Road Canyon Formation, USNM 732.] NUMBER 21 2301 PLATE 509.?Divaricosta, Fascicosta, and Allorhynchus. 2 3 0 2 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 510 Strigirhynchia, Paranorella, Cenorhynchia, Bryorhynchus, Anteridocus, Cleiothyridina, and Pontisia Strigirhynchia elongata, new species: 1, Posterior, anterior, side, ventral, and dorsal views, XI, paratype USNM 154687 (broken); 2-4, side, anterior, and dorsal views of the preceding speci? men, X2; 5-11, dorsal view, XI, and ventral, dorsal, side, anterior, and posterior views, X2, and dorsal view, X4, showing the deltidial plates with reflected lip, holotype USNM 154688a; 12, interior of the brachial valve, X3, showing hinge plate and median septum, paratype USNM 154688b. [Bell Canyon Formation (Lamar Member), USNM 728p.] 38, Dorsal, X2, and dorsal, side, and anterior views, XI, of a small specimen, paratype USNM 155133. [Bell Canyon Formation (Lamar Member), USNM 728i.] Paranorella species 2: 13-15, Ventral and dorsal views, XI, and dorsal view, X2, of an imma? ture individual, figured specimen USNM 154690a; 16, 17, exterior and interior views, XI, of the pedicle valve, figured specimen USNM 154690b; 18, 19, exterior and interior of a brachial valve, XI, figured specimen USNM 154690c; 20, interior of the preceding brachial valve, X2, showing the cardinalia. [Bone Spring Formation, USNM 728c] Paranorella species 6: 21-23, Interior and exterior, XI, and interior, X2, of a pedicle valve, figured specimen USNM 154689a; 24-26, interior and exterior, XI, and interior, X2, of a brachial valve, showing the cardinalia, figured specimen, USNM 154689b. [Skinner Ranch For? mation (Dugout Mountain Member), USNM 732c] Cenorhynchia camerata, new species: 27-29, Dorsal, side, and anterior views, X2, paratype USNM 155069a (for natural size, see Plate 521: figures 53-57); 30, interior, X3, showing crura and septum, paratype USNM 155069g; 31, 32, interior of two dorsal valves, X3, showing hinge plate and septum, paratypes USNM 155069h, i. [Neal Ranch Formation (bed 4), USNM 727c] Cenorhynchia saginata, new species: 33, Anterior, posterior, side, dorsal, and ventral views of a complete adult, XI, paratype USNM 153487; 34-37, side, anterior, ventral, and dorsal views of the same specimen, X2. [Neal Ranch Formation (bed 4), USNM 727c] Bryorhynchus nitidum (Girty): 39?43, Anterior, dorsal, side, posterior, and ventral views, XI, of the holotype USNM 118563. [Bone Spring Formation, USGS 2920 (green).] Anteridocus bicostatus, new species: 44-47, Posterior, anterior, side, ventral, and dorsal views, XI, and anterior, dorsal and side views, X2, of a complete specimen, paratype USNM 154685. [Bell Canyon Formation (Hegler Member), USNM 731.] Cleiothyridina rara, new species: 48-55, Dorsal, posterior, anterior, ventral, and side views, XI, and anterior, dorsal, and side views, X2, of a complete specimen, holotype USNM 154518. [Word Formation (Willis Ranch Member), USNM 706c] Pontisia stehlii tumidosa, new subspecies: 56, Posterior, anterior, side, ventral, and dorsal views, XI, paratype USNM 154686a; 57-59, anterior, side, and dorsal views, X2, of same specimen; 60, 61, Anterior view, XI, X4, showing the cardinalia, paratype USNM 154686b; 62, interior of the pedicle valve, X2, showing disjunct deltidial plates, paratype USNM 154686c. [Cathedral Mountain Formation, USNM 726u.] NUMBER 21 2303 PLATE 510.?Strigirhynchia, Paranorella, Cenorhynchia, Bryorhynchus, Anteridocus, Cleiothyridina, and Pontisia. 2 3 0 4 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 511 Lirellaria and Aphaurosia Lirellaria costellata, new species: 1-4, Ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, anterior, and side views, X2, of the paratype USNM 152819. [Bell Canyon Forma? tion (Lamar Member), AMNH 40.] 5, 6, Interior and posteriorly tilted views of the brachial valve, X3, showing cardinalia and slight median ridge, paratype USNM 154696a. [Bell Canyon Formation (Lamar Member), USNM 725c] 7-9, Exterior, XI, and exterior and interior, X2, of the pedicle valve, paratype USNM 154692a; 10, posterior of the preceding pedicle valve, X4, showing small, disjunct deltidial plates; II, 12, dorsal view of the interior of a brachial valve, XI, X3, showing the crura, para? type USNM 154692b. [Bell Canyon Formation (Lamar Member), USNM 738.] 13, Dorsal, posterior, side, anterior, and ventral views, XI, of a young specimen, paratype USNM 152821a; 14-17, dorsal, posterior, side, anterior, and ventral views, XI, and side, anterior and dorsal views, X2, of a complete individual, paratype USNM 152821c. [Bell Canyon Formation (Lamar Member), AMNH 40.] 18, 19, Interior of the pedicle valve, XI, X4, showing conjunct deltidial plates, paratype USNM 154693b; 20, interior of the brachial valve, X4, paratype USNM 154693a. [Bell Canyon Formation (Lamar Member), USNM 725c] Lirellaria? species 1: 21, Exterior, interior tilted to show dental plates, and interior views of a pedicle valve, XI, figured specimen USNM 152823; 22, beak of the preceding, X2. [Word Formation (Willis Ranch Member), USNM 706c] Lirellaria diabloensis, new species: 23, 24, Dorsal, side, posterior, and ventral views of a damaged specimen, XI, dorsal view, X2, holotype USNM 152822; 25, posterior of the preceding specimen, X4, showing conjunct deltidial plates. [Bone Spring Formation, AMNH 591.] Aphaurosia rotundata, new species: 26-30, Ventral, anterior, side, and dorsal views, XI, and dorsal view, X2, of a complete specimen, paratype USNM 152808. [Bell Canyon Formation (Rader? Member), AMNH 404.] 31-38, Anterior, posterior, side, ventral, and dorsal views, XI, and dorsal, side, and anterior views, X2, of the paratype USNM 152806b; 39-43, posterior, anterior, dorsal, side, and ventral views, XI, of another complete specimen, paratype USNM 152806a; 49-51, interior of the brachial valve, X1.5, and tilted and interior views, X3, showing the hinge plate and crura, paratype USNM 154694b. [Bell Canyon Formation (Lamar Member), USNM 738.] 44-48, Anterior, side, posterior, ventral, and dorsal views, XI, of a damaged specimen, para? type USNM 152807b; 52-54, interior, X1.5, and interior and posteriorly tilted views, X3, show? ing the cardinalia, paratype USNM 154695a; 55-58, laterally tilted to right, XI, and laterally tilted to right and left views, and interior view, X4, of another brachial valve showing hinge plate and crura, paratype USNM 154695c; 59, interior, X3, of an incomplete specimen showing dorsal side of crura and hinge plate, paratype USNM 154695b; 60, posterior of a brachial valve, X4, showing the hinge plate, paratype USNM 154695c; 61-64, posterior, anterior, side, dorsal, and ventral views, XI, and anterior, side, and dorsal views, X2, of a complete specimen, para? type USNM 154927. [Bell Canyon Formation (Lamar Member), USNM 725c] NUMBER 21 2305 PLATE 511.?Lirellaria and Aphaurosia. 2 3 0 6 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 512 Amphipella and Acolosia Amphipella arcaria Cooper and Grant: 1-4, Ventral, posterior, side, anterior, and dorsal views, X2, XI, of four paratypes USNM 148098a', d', ?', g'; 5-10, ventral, posterior, side, anterior, and dorsal views, X2, dorsal view, XI, and side, posterior, anterior, dorsal, and ventral views, X6, holotype USNM 148098a; 11-16, ventral, posterior, side, anterior, and dorsal views, X2, dorsal view, XI, and side, posterior, anterior, ventral, and dorsal views, X6, hypotype USNM 154702f; 17-21, posterior, anterior, side, dorsal, and ventral views of another complete specimen, X6, hypotype USNM 154702a; 22-24, posterior, side, and dorsal views of a complete specimen, X4, hypotype USNM 154700a; 25, dorsal view of a specimen distorted in life, X4, hypotype USNM 154700b; 26, anterior view of the interior, X6, showing shelly pouches and cardinalia, paratype USNM 148098b; 27, interior of the pedicle valve, X4, showing pouches and dental lamellae, hypotype USNM 154700c; 28, 29, interior tilted posteriorly and in full view of another pedicle valve, X4, showing pouches and dental plates, hypotype USNM 154700d; 30, another pedicle valve tilted to show the dental plates, X4, hypotype USNM 154700f; 31, interior of another pedicle valve, X4, showing the teeth, hypotype USNM 154700e; 32, side view of a specimen partially broken to show closed pouch, X6, hypotype USNM 154700g; 33, specimen with part of the pedicle valve removed to show pouches and cardinalia, X6, hypotype USNM 154702h; 34, interior showing the long crura, X4, paratype USNM 154700h; 35, interior of a brachial valve, X6, showing undivided hinge plate and long crura, hypotype USNM 154702i; 36, partial side view of a specimen broken to show the pouch and cardinalia, X4, paratype USNM 148098e; 37, interior of a distorted brachial valve, X4, hypotype USNM 1547001; 38, 39, posteriorly tilted and interior views of a brachial valve, X4, showing nearly complete hinge plate, hypotype USNM 154700J; 40, interior of the pedicle valve, X6, hypotype USNM 154700k; 41, 42, interior of two brachial valves, X6, showing cardinalia, hypotype USNM 154700o and paratype 149098d; 43, 44, interior and laterally tilted views of another brachial valve with incomplete hinge plate, X4, hypotype USNM 154700-1; 45, 46, posteriorly tilted and interior views of a brachial valve, X4, hypotype USNM 154702d; 47, interior of the pedicle valve with cardinalia of brachial valve seen in dorsal view, X4, hypotype USNM 154700n. [Cathedral Mountain Formation (base), USNM 708u.] Amphipella attenuata, new species: 48, 49, Interior of a pedicle valve, X3, X9, holotype USNM 148102. [Road Canyon Formation, USNM 703a.] Acolosia? anomala, new species: 50-53, Dorsal, anterior, side, posterior, and ventral views, XI, and anterior, side, and dorsal views, X2, of the holotype USNM 152799a; 54, ventral side of the holotype, X2, showing cardinalia; 55, 56, posterior of the holotype tilted and in normal view to show the cardinalia, X6. [Word Formation (Willis Ranch Member), USNM 706c] NUMBER 21 2307 PLATE 512.?Amphipella and Acolosia. ^^F> i^W jpp ^^W VHP " 2308 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 513 Ptilotorhynchus, Iotina, Acolosia, and Madarosia Ptilotorhynchus delicatum, new species: 1-5, Anterior, posterior, dorsal, side, and ventral views, XI, of the holotype USNM 148219. [Capitan Formation, USNM 739.] 6, 7, Dorsal view of a crushed specimen, XI, X2, paratype USNM 154711. [Bell Canyon For? mation (Lamar Member), AMNH 430.] 8, Ventral, posterior, side, anterior, and dorsal views, X 3, of a young specimen, paratype USNM 154713. [Cherry Canyon Formation (Getaway Member), USNM 732.] 9-12, Interior, X2, X6, and interior laterally tilted, X2, X6, of a brachial valve showing the cardinalia, paratype USNM 154710a; 13, interior of the pedicle valve belonging to the preceding, X6, sohwing conjunct deltidial plates and reflected foramenal edge, paratype USNM 154710a; 16, 17, interior of pedicle valve, X2, X8, showing deltidial plates with their reflected margin, paratype USNM 154710e; 18, posterior of another pedicle valve, X4, showing deltidium and foramen, paratype USNM 154710h. [Bell Canyon Formation (Lamar Member), USNM 725c] 14, 15, Interior of the brachial valve, X2, X6, showing the cardinalia, paratype USNM 154714. [Bell Canyon Formation (Lamar Member), USNM 738.] Iotina minuta, new species: 19, Ventral, posterior, side, anterior, and dorsal views, X2, and dorsal view, XI, paratype USNM 152818a; 20-23, ventral, posterior, side, anterior, and dorsal views, X2, dorsal view, XI, and dorsal, anterior, and side views, X4, holotype USNM 152818b; 24-26, interior of the brachial valve, X2, and interior and laterally tilted views, X4, paratype USNM 152818i; 27-29, interior of the pedicle valve, X2, and posteriorly tilted and interior views of the same specimen, X4, paratype USNM 152818J. [Bone Spring Formation, AMNH 591.] Acolosia elliptica, new species: 30-35, Anterior, side, posterior, ventral, dorsal, XI, and dorsal views, X2, holotype USNM 148203a; 36-38, anteriorly tilted, interior, and laterally tilted views of the brachial valve, X6, paratype USNM 148203b. [Hess Formation (Taylor Ranch Member), USNM 702d.] Madarosia pentagona, new species: 39, Interior of the pedicle valve, X2, showing dental plates, paratype USNM 154930; 40, 41, laterally tilted and interior views of the brachial valve of the same specimen, X2, showing cardinalia (for exterior views see Plate 548: figure 18). [Cherry Canyon Formation (Getaway Member), AMNH 512.] Acolosia glabra, new species: 42, Ventral, posterior, side, anterior, and dorsal views of a com? plete specimen, XI, paratype USNM 148173b; 43, ventral, posterior, side, anterior, and dorsal views, XI, of another complete specimen, paratype USNM 148173a; 44-47, ventral, posterior, side, anterior and dorsal views, XI, and dorsal, anterior, and side views, X2, holotype USNM I48173e; 48, 49, ventral views of a specimen with pedicle valve partially removed to show cardinalia, X2, X6, paratype USNM 148173d; 50, 51, interior of the pedicle valve, and pos? teriorly tilted views, X2, showing lack of deltidial plates and presence of dental plates, para? type USNM 154715c; 52, interior of brachial valve, X2, showing an undivided hinge plate, paratype USNM 154715e; 53, 54, interior and laterally tilted views of a brachial valve, X2, showing divided hinge plate, paratype USNM 154715d; 55, 56, interior and laterally tilted views of the preceding specimen, X6, showing the hinge plate. [Word Formation (China Tank Member), USNM 706c] Acolosia recepta, new species: 57-60, Anterior, dorsal, XI, posterior, ventral, side, and dorsal views, X2, and posterior, anterior, and side views, X4, holotype USNM 152801a; 61, 62, pos? teriorly tilted and interior views of the pedicle valve, X6, paratype USNM 152801b; 63, 64, laterally tilted and interior views of the brachial valve, X6, showing cardinalia, paratype USNM 152801c. [Skinner Ranch Formation (Poplar Tank Member), USNM 707h.] NUMBER 21 2309 PLATE 513.?Ptilotorhynchus, Iotina, Acolosia, and Madarosia. 2 3 1 0 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 514 Strigirhynchia and Phrenophoria Strigirhynchia transversa, new species: 1-5, Posterior, anterior, side, ventral, and dorsal views of a large adult, XI, holotype USNM 152863a; 6-11, posterior, anterior, side, ventral, and dorsal views, XI, and dorsal view, X1.5, paratype USNM 152863b; 12-17, posterior, anterior, side, dorsal, and ventral views, XI, and dorsal view, X1.5, of a young adult, paratype USNM 152863c [Captain Formation, USNM 750a.] 18-23, Anterior, side, posterior, dorsal, and ventral views, XI, and dorsal view, X1.5, paratype USNM 154716. [Capitan Formation, USNM 725k.] 24-28, Anterior, posterior, ventral, side, and dorsal views, XI, paratype USNM 154717. [Capitan Formation, USNM 740.] Phrenophoria bicostata, new species: 29, 30, Ventral, posterior, side, anterior and dorsal views, XI, and dorsal view, X2, of a complete specimen, paratype USNM 152825m; 31-34, ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, anterior, and side views, X3, para? type USNM 152825n; 35, 36, interior of pedicle valve, X2, X6, showing teeth and disjunct deltidial plates, paratype USNM 152825k; 37, 38, interior and laterally tilted views of the brachial valve, X2, paratype USNM 152825i; 39, interior of the preceding brachial valve, X6, showing the undivided hinge plate. [Word Formation (Appel Ranch Member), USNM 7l9z.] Phrenophoria corpulenta, new species: 40-44, Posterior, anterior, side, ventral, and dorsal views, XI, holotype USNM 152826f; 45-49, ventral, posterior, side, anterior, and dorsal views of a young specimen, XI, paratype USNM 152826d; 50, dorsal view, X2, of an adult, paratype USNM 152826h; 51, 52, dorsal, anterior, side, and dorsal views, XI, of two young and com? pressed individuals, paratypes USNM 152826a, b; 53, interior, posteriorly tilted, and laterally tilted views, X2, paratype USNM 154718; 54, posterior part of the preceding specimen, X6, showing the undivided hinge plate and median septum. [Bone Spring Formation (Cutoff Mem? ber), AMNH 678.] Phrenophoria depressa, new species: 55-58, Ventral, posterior, side, anterior, and dorsal views, XI, and anterior, side, and dorsal views, X2, of a complete specimen, paratype USNM 148773b; 59-62, ventral, posterior, side, anterior, and dorsal views, XI, and anterior, dorsal, and side views, X2, holotype USNM 148773a; 63-65, interior posteriorly tilted, interior, and laterally tilted views of the brachial valve, XI.5, paratype USNM 1487731; 66-68, interior, posteriorly tilted, and laterally tilted views of the preceding specimen, X2, showing the undivided hinge plate; 69, interior of the same brachial valve, X3, tilted to show median septum and muscle scars; 70, 71, interior and posteriorly tilted views of the pedicle valve, X2, showing the dental plates, paratype USNM 148773h. [Skinner Ranch Formation (Sullivan Peak Member), USNM 707d.l NUMBER 21 2311 PLATE 514.?Strigirhynchia and Phrenophoria. 2312 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 515 Cenorhynchia, Anteridocus, Acolosia?, Aphaurosia, Wellerella, Tautosia, Phrenophoria, and Pontisia Cenorhynchia fracida, new species: 1-4, Posterior, anterior, side, ventral, and dorsal views, XI, and anterior, side, and dorsal views, X3, paratype USNM 154721. [Word Formation (Willis Ranch Member), USNM 706c] 36-41, Dorsal view, XI, and side, anterior, posterior, ventral, and dorsal views, X2, of a damaged specimen, paratype USNM 154722; 42, dorsal view, X4, of the preceding specimen. [Word Formation (Appel Ranch Member), USNM 727j.] Anteridocus paucicostatus, new species: 5, 7, Ventral, posterior, side, anterior, and dorsal views, X2, and dorsal view, XI, of two paratypes USNM 154723a, c; 6, ventral, posterior, side, anterior, and dorsal views, X2, and dorsal view, XI, holotype USNM 154723b. [Skinner Ranch Forma? tion (Sullivan Peak Member), USNM 733j.] Acolosia} exasperata, new species: 8-11, Posterior, anterior, side, dorsal, and ventral views, XI, and dorsal, anterior, and side views, X2, holotype USNM 152800a. [Skinner Ranch Formation (base), USNM 720c] Aphaurosia scutata, new species: 12, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 154727. [Bell Canyon Formation (Lamar Member), USNM 738.] 13-16, Ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, anterior, and side views, X2, holotype USNM 154726. [Bell Canyon Formation (Lamar Member), USNM 725c] 17-21, Anterior, posterior, side, ventral, and dorsal views of a complete specimen, XI, para? type USNM 154725b; 22, interior of the pedicle valve, XI, showing the dental plates, paratype USNM 154724a; 23, interior of the brachial valve, XI, paratype USNM 154724b; 24, 25, interior tilted and in direct view of the preceding specimen, X3, showing the hinge plate and crura. [Bell Canyon Formation (Lamar Member), USNM 738b.] Wellerella girtyi girtyi, new subspecies: 26-28, Interior, posteriorly tilted, and laterally tilted views of the brachial interior, X4, showing the hinge plate and crura, paratype USNM 154733b. [Word Formation (Willis Ranch Member), USNM 706e.] Tautosia cf. T. pulchra, new species: 29, Interior of a brachial valve, X3, showing cardinalia and median septum, paratype USNM 154730. [Cathedral Mountain Formation, USNM 721u.] Phrenophoria bicostata, new species: 30, Dorsal view, XI, and posterior, anterior, side, ventral, and dorsal views, X2, holotype USNM 154729a; 31, 32, exterior and interior, X2, of the brachial valve, paratype USNM 154729b; 33, 34, exterior and interior of another brachial valve, X2, paratype USNM 154729c; 35, interior of the preceding specimen, X4, showing the hinge plate and median septum. [Word Formation (Appel Ranch Member), USNM 719z.] Pontisia nanas (Stehli): 43, Dorsal view, XI, and posterior, anterior, side, dorsal, and ventral views, X2, hypotype USNM 154728a; 44, broken specimen, X2, showing dorsal side of cardinalia and absence of a median septum, hypotype USNM 154728b. [Bone Spring Formation, USNM 725c] Cenorhynchia saginata, new species: 45-48, Ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, side, and anterior views, X2, of a complete specimen, paratype USNM 154731a; 49-52, ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, side, and anterior views, X2, of another paratype USNM 154731b; 53-56, ventral, posterior, side, anterior, and dorsal views, XI, and anterior, side, and dorsal views, X2, paratype USNM 154731c. [Cibolo Formation (Thin-bedded Zone of Udden), USNM 738-1.] NUMBER 21 2313 PLATE 515.?Cenorhynchia, Anteridocus, Acolosia?, Aphaurosia, Wellerella, Tautosia, Phrenophoria, and Pontisia. 4^ ^^ H ^ f c 4 . 4P w^ ? \y- fl ^ 39 36 AJS** 37 40 41 42 wmi* / x 38 45^ I '46' A 49 V l . l 53 . 50 U 47 48 54 51 55 52 56 2314 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 516 Pontisia and Phrenophoria Pontisia truncata, new species: 1-3, Side, dorsal, and anterior views, XI, of the holotype, USNM 154734; 4, 5, interior of the brachial and pedicle valves of the holotype, X2, showing conjunct deltidial plates and undivided hinge plate. [Road Canyon Formation, USNM 732j.] Phrenophoria nesiotes, new species: 6-10, Posterior, anterior, side, dorsal, and ventral views, XI, of a paratype USNM 148355f; 11-15, posterior, anterior, side, ventral, and dorsal views, XI, holotype USNM 148355h; 16-20, ventral, dorsal, posterior, side, and anterior views of another complete specimen, XI, paratype USNM 148355J; 21-25, posterior, side, anterior, ventral, and dorsal views of an adult, XI, paratype USNM 148355g; 26-30, anterior, posterior, side, ventral, and dorsal views of a young adult, XI, paratype USNM 148355i; 31, dorsal views, XI, immature paratypes 148355a, a' (top row), 148355b (middle row), and 148355c (bottom row); 32, ventral view of a specimen broken to show the cardinalia, X1.5, paratype USNM 148673c; 33, 34, two paratypes in partial side view, X1.5, showing cardinalia and median septum, USNM 148673b, a; 35, ventral view of another broken specimen, XI, showing the cardinalia, paratype USNM 148673d; 36, interior of the pedicle valve, XI, showing disjunct deltidial plates, paratypes USNM 154735c; 37, posterior of a fragmentary brachial valve, X6, showing the undivided hinge plate and median septum, paratype USNM 154735b; 38, hinge plate of another brachial valve, X6, paratype USNM 154735a; 39, 40, fragmentary brachial valve, X2, X6, showing hinge plate and median septum, paratype USNM 154735e; 41, 42, posterior and side views of another fragmentary brachial valve, X6, showing the crura, paratype USNM 154735d. [Cathedral Mountain Forma? tion, USNM 708u.] Phrenophoria perplexa, new species: 43-48, anterior, posterior, side, ventral, and dorsal views, XI, and posterior, X3, showing conjunct deltidial plates, paratype USNM 152828a; 58, ventral view of the interior, X2, showing dental plates and cardinalia, paratype USNM 154736-1. [Bell Canyon Formation (Rader Member), USNM 725f.] 49-53, posterior, side, anterior, ventral, and dorsal views, XI, holotype USNM 154595a; 54, posterior of the pedicle valve, X3, showing the conjunct deltidial plates, paratype USNM 154595b. [Bell Canyon Formation (Rader Member), USNM 740j.] 55, 57, interior of two specimens, X3, showing the hinge plate, crura and median septum, paratypes USNM 155074f, c [Bell Canyon Formation (Rader Member), USNM 740a.] 56, interior of the posterior of both valves, X3, showing median septum and dental plates, paratype USNM 155075-1. [Bell Canyon Formation (Rader Member), USNM 740j.] NUMBER 21 2315 PLATE 516.?Pontisia and Phrenophoria. 2316 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 517 Antronaria, Anteridocus, Pontisia, Cenorhynchia, Phrenophoria, and Madarosia Antronaria mesicostalis (Girty): 1-5, Anterior, posterior, side, ventral, and dorsal views, XI, paratype USNM 154742a; 6-10, ventral, dorsal, side, posterior, and anterior views, XI, paratype USNM 154742b; 11-15, posterior, anterior, side, ventral, and dorsal views of =? young individual, XI, paratype USNM 154742c; 16, 17, posteriorly tilted and interior views of the brachial valve, X2, showing the hinge plate and lack of median septum, paratype USNM 154742d. [Bone Spring Formation, USNM 728c] Anteridocus seminudus, new species: 18, Ventral, posterior, side, anterior, and dorsal views, X2, and dorsal view, X] , paratype USNM 154746a; 19, 20, ventral, posterior, side, anterior, and dorsal views, X2, and dorsal view, XI, of two paratypes USNM 154746b, c. [Road Canyon For? mation, USNM 724b.] Pontisia stehlii stehlii Cooper and Grant: 21-24, Posterior, anterior, side, ventral, and dorsal views, XI, and anterior, side, and dorsal views, X2, paratype USNM 154743a; 25, interior of the brachial valve, X3, showing the hinge plate and lack of median septum, paratype USNM 154743b. [Cathedral Mountain Formation, USNM 726o.] 38-42, Ventral, posterior, side, anterior, and dorsal views, XI, of five paratypes USNM 154745a-d, f; 43, ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 154745g; 44, dorsal view of an immature specimen, XI, paratype USNM 154745e; 45, ventral view of a specimen with ventral beak region removed to show the cardinalia, X2, paratype USNM 154745h; 46, interior of the brachial valve, XI, paratype USNM 154745J; interior of the brachial valve, X3, showing the cardinalia, paratype USNM 154745i. [Cathedral Mountain Formation, USNM 726o.] Madarosia anterolamellata, new species: 48-52, Dorsal, posterior, side, ventral, and anterior views of a complete specimen, XI, holotype USNM 154744a; 53, anterior of a paratype, XI, showing the anterior lamellae, USNM 154744b; 54, broken specimen, X2, showing delicate cardinalia and median septum, paratype USNM 154744c. [Bell Canyon Formation (Rader Mem? ber), USNM 725f.] Cenorhynchia species 1: 26-30, Anterior, posterior, side, dorsal, and ventral views, X2, figured specimen USNM 153492a; 31-35, dorsal, ventral, side, posterior, and anterior views, X2, of a complete individual, figured specimen USNM 153492b. [Skinner Ranch Formation, USNM 726h.] Phrenophoria pentagonalis, new species: 36, 37, Ventral, posterior, side, anterior, and dorsal views, XI, of the holotype and a paratype USNM 148575a, b. [Road Canyon Formation, USNM 703d.] NUMBER 21 2317 PLATE 517.?Antronaria, Anteridocus, Pontisia, Cenorhynchia, Phrenophoria, and Madarosia. ff.l.K 3 6 27 ? VVJ 1 r < i .fc%/ 28 31 30 V\ ?#

< i fc 29 aw- TW * ^ - ? 50 51 2330 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 524 Tautosia and Phrenophoria Tautosia expansa, new species: 1, 2, Ventral, posterior, side, anterior, and dorsal views, XI, of two paratypes USNM 148589e, c; 3-6, ventral, posterior, side, anterior, and dorsal views, XI, and anterior, dorsal, and side views, X2, holotype USNM 148589d; 7-9, ventral and laterally tilted views, X1.5, and ventral view, X3, of a specimen with pedicle valve beak removed to show cardinalia, paratype USNM 148589g. [Bone Spring Formation (Cutoff Member), USNM 747.] Phrenophoria vetula, new species: 10-14, Anterior, posterior, side, ventral, and dorsal views, XI, paratype USNM 152832. [Cathedral Mountain Formation, USNM 702.] Tautosia fastigiata Cooper and Grant: 15, Two immature hypotypes, XI, USNM 148342c, e; 18-22, anterior, dorsal, side, posterior, and ventral views, XI, hypotype USNM 154792a; 23, 49, interior and posteriorly tilted views of a pedicle valve, XI, X1.5, showing the muscle scars, hypotype USNM 154793d; 24-28, anterior, posterior, side, dorsal, and ventral views of a large adult, XI, hypotype USNM 154792c; 31-35, dorsal, ventral, side, anterior, and posterior views, XI, of another complete specimen, hypotype USNM 154792b; 36-39, anterior, dorsal, posterior, and ventral views, XI, of a large complete specimen, holotype, USNM 148345f; 48, left flank of preceding specimen, X2, showing notches at end of costae; 41-45, ventral, dorsal, side, pos? terior, and anterior views, XI, of a large adult, paratype USNM 148345e; 47, anterolateral view of a broken specimen, X2, showing the crura, hypotype USNM 154793f; 51, 52, partial side and ventral views of another broken specimen, X2, showing the cardinalia, hypotype USNM 154793a; 53, anterior view of the interior, X2, showing median septum and crura, hypotype USNM 154793c [Cathedral Mountain Formation, USNM 702b.] 16, Dorsal, anterior, and side views of another immature individual, XI, showing its com? pressed form, hypotype USNM 154794c; 17, 46, dorsal, anterior, and side views, XI, and dorsal view, X3, of another compressed young individual, showing conjunct deltidial plates, hypotype USNM 794d; 50, immature specimen, X3, without deltidial plates, hypotype USNM 154794a. [Cathedral Mountain Formation, USNM 726x.] 29, 30, Dorsal view of a young adult, XI, and its beak, X3, showing conjunct deltidial plates, hypotype USNM 154795. [Cathedral Mountain Formation, USNM 702.] 40, Ventral view of a specimen with gastropod? boring, XI, hypotype USNM 154796a. [Cathedral Mountain Formation, AMNH 500L = 702b.] NUMBER 21 2331 PLATE 524.?Tautosia and Phrenophoria. 4fi? * m$ * r. /i ->j r 1 0%, ^ ? | 4Mb 4 & i #^ ^ : ? ? ? ! ? JO / ^ / i \ 11 12 //M 13 14 2332 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 525 Tautosia, Phrenophoria, and Acolosia Tautosia fastigiata Cooper and Grant: 1, Ventral view of the cardinalia, X4, showing crura, paratype USNM 154793c [Cathedral Mountain Formation, USNM 702b.] Tautosia galbina, new species: 2, Ventral, posterior, side, anterior, and dorsal views, XI, para? type USNM 154798a; 3-6, ventral, posterior, side, anterior, and dorsal views, XI, and side, anterior, and dorsal views, X2, holotype USNM 154798b. [Road Canyon Formation, USNM 722g.] 7, 8, Ventral, posterior, side, anterior, and dorsal views, XI, paratypes USNM 148352a, e; 9-11, anterior, side, and dorsal views, X2, of another complete specimen, paratype USNM 148352d; 12, specimen with beak broken away to show crura, X3, paratype USNM 154797. [Road Canyon Formation, USNM 707c] Phrenophoria irregularis, new species: 13, 14, Internal mold of a specimen, XI, showing the dental plates and median septum, paratype USNM 152836c; 15, posterior of the preceding specimen, X1.5, showing septa; 16-23, dorsal, posterior, ventral, anterior, and side views, XI, and anterior, side, and dorsal views, X1.5, holotype USNM 152836a; 24, interior of the pedicle valve, X2, showing the muscle scars, paratype USNM 152836d; 25, posteriorly tilted view of the brachial valve, X2, showing the hinge plate and median septum, paratype USNM 152836c [Cherry Canyon Formation (Getaway Member), AMNH 512.] Tautosia lenumbona (Stehli): 26-29, Ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, anterior, and side views, X2, of a complete specimen, hypotype USNM 152837. [Bone Spring Formation, AMNH 625.] 30, 31, Anteriorly tilted view, X2, and interior view, X4, of the pedicle valve, showing dis? junct deltidial plates and traces of the muscle scars, hypotype USNM 154799a; 32, 33, laterally tilted and interior views of the brachial valve, X3, showing the hinge plate and median septum, hypotype USNM 155105a; 34, partial side view, X3, showing hinge plate and crura, hypotype USNM 155105b; 35, interior of a brachial valve, X3, showing septum, hypotype USNM 155105c. [Bone Spring Formation, USNM 728f.] Tautosia magnisepta (Stehli): 36, 37, Interior of the brachial valve, X2, X4, showing divided hinge plate and median septum, hypotype USNM 154800. [Bone Spring Formation, AMNH 629.] 38-41, Dorsal, posterior, side, anterior, and ventral views, XI, and dorsal, anterior, and side views, X2, of a complete specimen, hypotype USNM 148355a; 42, 43, laterally tilted and interior views of the brachial valve, X2, showing the median septum and undivided hinge plate, hypo? type USNM 148355d; 44, interior of the pedicle valve, XI, hypotype USNM 148355c; 45, interior of the pedicle valve, X2, showing disjunct deltidial plates and muscle scars, hypotype USNM 148355b. [Bone Spring Formation, USNM 728f.] Tautosia podislra, new species: 46, Ventral, posterior, side, anterior, and dorsal views, XI, holotype USNM 152839c; 47-50, ventral, posterior, side, anterior, and dorsal views, XI , and dorsal, side, and anterior views, X2, paratype USNM 152839e; 51, interior of the brachial valve, X4, showing hinge plate and median septum, paratype USNM 152839g. [Skinner Ranch For? mation (Sullivan Peak Member), USNM 707-1.] Acolosia magna, new species: 52-55, Ventral, posterior, side, anterior, and dorsal views, XI, and anterior, dorsal, and side views, X3, holotype USNM 148207. [Skinner Ranch Formation (Decie Ranch Member), USNM 714t.] NUMBER 21 2333 PLATE 525.?Tautosia, Phrenophoria, and Acolosia. vi 11 * 4 IV ? i l ^ #?* ? <% | ^ ?aWaaW. 15 v I J 16 4 13 14 31 ! - * ^ ^1^ # * ft ^^ f^c 2334 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 526 Tautosia Tautosia pulchra, new species: 1, Dorsal views of three immature paratypes, XI, USNM 148368b, c, f; 13-16, ventral, posterior, side, anterior, and dorsal views, XI, of four paratypes USNM 148368d, h, g and 154801c; 17-20, interior, laterally tilted, and posteriorly tilted views of the brachial valve, X3, showing the cardinalia, and posteriorly tilted view of the pedicle valve, X3, showing dental plates of the same specimen, paratype USNM 154801a. [Cathedral Mountain Formation, USNM 702ent.] 2-6, Posterior, anterior, side, ventral, and dorsal views of an adult, XI, paratype USNM 148374a; 7-12, dorsal, side, anterior, ventral, and posterior views, XI, holotype USNM 148374b. [Cathedral Mountain Formation, USNM 702.] Tautosia shumardiana (Girty): 21, Ventral, posterior, side, anterior, and dorsal views, XI, of a complete specimen, hypotype USNM 148680c; 27-31, ventral, posterior, side, anterior, and dorsal views of a complete adult, XI, hypotype USNM I48680d. [Capitan Formation, USNM 740.] 22-26, Ventral, posterior, side, anterior, and dorsal views, XI, of a young individual, hypo? type USNM 148675. [Capitan Formation, USNM 737a.] 32-36, Ventral, side, dorsal, posterior, and anterior views, XI, holotype USNM 118566a. [Capitan Formation, USGS 2926 (green).] 37-41, Dorsal, anterior, posterior, side, and ventral views of a large adult, XI, hypotype USNM 154804. [Capitan Formation, USNM 725-1.] 42, 43, Exterior and interior of a pedicle valve, XI, hypotype USNM 154805. [Bell Canyon Formation (Hegler Member), AMNH 524.] 44, 45, Posteriorly tilted view, XI, and interior view, X2, of another pedicle valve, hypotype USNM 154803a; 46, ventral view of a specimen with beak removed to show hinge plate and crura, X2, hypotype USNM 154803c; 47-49, ventral view of another specimen broken to show the cardinalia, XI, and ventral and laterally tilted views of the same specimen, X3, showing a divided hinge plate and long crura, hypotype USNM 154803b; 50, posterior view of another brachial valve, X5, showing the posteriorly fused hinge plate and long crura, hypotype USNM 154803d; 51, partial side view of a broken specimen, X3, showing median septum and crura, hypotype USNM 154802b. [Bell Canyon Formation (Lamar Member), USNM 725c] NUMBER 21 2335 PLATE 526.?Tautosia. 2336 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 527 Tautosia and Wellerella Tautosia transenna, new species: 1, Dorsal views of two immature paratypes, XI, USNM 148402c, d; 13, 14, ventral, posterior, side, anterior, and dorsal views, XI, and anterior view, X2, showing the notched costae, holotype USNM 148402e; 15, ventral, posterior, side, anterior, and dorsal views, XI, of a paratype USNM 154808a; 21, interior of the pedicle valve, X2, showing conjunct deltidial plates and muscle scars, paratype USNM 154808b; 27-29, interior posteriorly tilted, interior, and laterally tilted views of the brachial valve, X5, showing fused hinge plate, median septum, and crura, paratype USNM 154808c. [Word Formation (lens between Willis Ranch and Appel Ranch members), USNM 706b.] 2-6, Posterior, anterior, side, ventral, and dorsal views, XI, of an obese specimen, paratype USNM 148409c; 16, 30, 31, side, dorsal, and anterior views of another complete specimen, XI, paratype USNM 154807a; 17, 18, laterally tilted and dorsal views of a specimen with part of brachial valve removed to show crura, X2, paratype USNM 154807b; 19, 20, laterally tilted and interior views, X4, showing long crura and fused hinge plate, paratype USNM 154807c; 22, 23, interior of the pedicle valve, X1.5, and X4.5, showing conjunct deltidial plates, para? type USNM 154807d; 24, anterior view, X5, showing median septum, crura, and hinge plate, USNM 154807c [Cherry Canyon Formation (Getaway Member), USNM 728.] 7-12, Side, posterior, ventral, dorsal, and anterior views, XI, and dorsal view, X2, paratype USNM 154809a; 25, 26, laterally tilted and interior views, X3, of a brachial valve with fused hinge plate, paratype USNM 154809b. [Word Formation (Willis Ranch Member), USNM 706c] Wellerella girtyi seorsa, new subspecies: 32, 33, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 148582f and holotype USNM 148582g; 34-36, interior, and pos? teriorly tilted views, X1.5, and posterior, X3, of the pedicle valve, showing conjunct deltidial plates, paratype USNM 148582h; 37-39, posteriorly tilted, laterally tilted, and interior views of the brachial valve, X3, showing crura and fused hinge plate, paratype USNM 148582i. [Cherry Canyon Formation (Getaway Member), USNM 728.] NUMBER 21 2337 PLATE 527.?Tautosia and Wellerella. 32 33 Jjkkr 36 ^ 35 37 38 i r 34 ^ " 39 2 3 3 8 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 528 Wellerella Wellerella girtyi girtyi, new subspecies: 1-3, Ventral, anterior, side, and dorsal views, XI , of three immature paratypes USNM 154732a-c; 4-8, posterior, side, anterior, ventral, and dorsal views, XI, of an adult, paratype USNM 148565J; 9-11, ventral, posterior, side, anterior, and dorsal views, XI, of three young adults, paratypes USNM 154732d-f; 12-16, ventral, posterior, side, anterior, and dorsal views of an adult, XI, paratype USNM 154732g; 17-21, ventral, posterior, side, anterior, and dorsal views, XI, of another adult, paratype USNM 154732h; 22-26, ventral, posterior, side, anterior, and dorsal views, XI, of the holotype, USNM 154732i; 27, 28, interior of an immature pedicle valve, X3, X6, showing incipient deltidial plates, paratype USNM 154811a; 29, 30, interior of an immature brachial valve, X3, X6, showing early beginnings of the hinge plate, paratype USNM 154811b; 31, 32, ventral view of an immature specimen, X3, X6, showing the cardinalia, paratype USNM 154811c; 33-35, posteriorly tilted view, X3, X6, and interior view, X3, of an immature individual, showing a well formed undivided hinge plate, paratype USNM 15481 Id; 36-38, interior and posteriorly tilted views, X6, and interior view, X3, of a brachial valve, showing immature stage of the cardinalia, paratype USNM 154811e; 39, 40, interior and posteriorly tilted views of another immature brachial valve, X5, showing incipient hinge plate, paratype USNM 154811f; 41, 42, posteriorly tilted and interior views, X3, showing hinge plate, crura, and median ridge, paratype USNM 154732J; 45, interior of the pedicle valve, X1.5, paratype USNM 154732k; 46, dorsal view of the cardinalia, X4, showing incipient median ridge, crura, and hinge plate, paratype USNM 15481 lg. [Word Formation (Willis Ranch Mem? ber), USNM 706c] 43, 44, Interior of the pedicle valve, X1.5, X4.5, showing conjunct deltidial plates, paratype USNM 154810. [Word Formation (Willis Ranch Member), USNM 706.] Wellerella nitidula, new species: 47-50, Ventral, posterior, side, anterior, and dorsal views, XI, and anterior, side, and dorsal views, X2, of a complete specimen, paratype USNM 154812. [Bone Spring Formation, AMNH 492.] 51-54, Ventral, posterior, side, anterior, and dorsal views, XI, and anterior, side, and dorsal views, X2, holotype USNM 152866c; 55, 56, ventral, posterior, side, anterior, and dorsal views, XI, of two adult paratypes USNM 152866f, d; 57-59, side, dorsal, and anterior views of another complete specimen, X2, paratype USNM 152866a; 60, interior of a pedicle valve without deltidial plates, X1.5, paratype USNM 152866g; 61, dorsal view of the interior, X3, showing the long crura, paratype USNM 152866i; 62, lateral view of the interior of another specimen, X3, showing the crura, paratype USNM 152866h. [Bone Spring Formation, AMNH 591.] NUMBER 21 2339 PLATE 528.?Wellerella. 0- Cd - ? * - ? 4 Paaad 29 M 9 11 A 4F^ t <~*? # hfllg/ J/itiM W\M ik%? 10 ^ 0 & f^\ ^ 2340 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 529 Anteridocus, Pontisia, and Antronaria Anteridocus bicostatus, new species: 1, Posterior, anterior, side, ventral, and dorsal views, XI, holotype USNM 152842a. [Bell Canyon Formation (Lamar Member), USNM 738b.] 2, Anterolateral view, X3, showing the crura but no septum, paratype USNM 154814. [Bell Canyon Formation (Lamar Member), AMNH 347.] 3-7, Posterior, anterior, side, ventral, and dorsal views, XI, of a complete specimen, paratype USNM 154813. [Bone Spring Formation (Cutoff Member), AMNH 678.] Pontisia costata, new species: 8-11, Ventral, posterior, side, anterior, and dorsal views, XI, and side, dorsal, and anterior views, X2, paratype USNM 154816r; 12-15, ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, side, and anterior views, X2, paratype USNM 152843b; 16-19, ventral, posterior, side, anterior, and dorsal views, XI, and side, anterior, and dorsal views, X2, holotype USNM 152843a; 20, interior of the pedicle valve, X1.5, paratype USNM 154816a; 21, posterior of the brachial valve, X6, paratype USNM 154816b; 22, 23, interior of the brachial valve, X3 and X4.5, showing cardinalia, paratype USNM 154816c [Skinner Ranch Formation (base), USNM 705a.] 24, 25, Posteriorly tilted and interior views, X3, showing cardinalia, paratype USNM 154815b; 26, side, anterior, dorsal, and ventral views, XI, paratype USNM 154815a. [Skinner Ranch Formation, USNM 724q.] Antronaria dissona, new species: 27-31, Dorsal, posterior, side, anterior, and ventral views, XI, paratype USNM 154818. [Skinner Ranch Formation (base), locality 720c] 32-36, Anterior, posterior, side, dorsal, and ventral views of a complete specimen, XI, para? type USNM 148766a; 42-46, posterior, anterior, side, ventral, and dorsal views of a complete specimen, XI, paratype USNM 148766b. [Skinner Ranch Formation (base), USNM 705a.] 37-41, Posterior, ventral, side, dorsal, and anterior views, XI, paratype USNM 148774a. [Skinner Ranch Formation (Decie Ranch Member), USNM 707w.] 47-49, Anterior, dorsal, and side views of a large individual, XI, paratype USNM 154820b; 63, partial side view of a broken specimen, XI, showing the crura, paratype USNM 154820c; 50-54, anterior, side, ventral, dorsal, and posterior views, XI, holotype USNM 154820a. [Bone Spring Formation, AMNH 492.] 55, Dorsal view of a small specimen, XI, paratype USNM 148776b; 56-59, ventral, side, dorsal, and anterior views, XI, paratype USNM 154817. [Skinner Ranch Formation (lower), USNM 71 lp.] 60, Specimen with broken beak, X2, showing the hinge plate and crura, paratype USNM 154819a; 61, anterior view of the interior, X2, showing the cardinalia, paratype USNM 154819b; 62, brachial valve, X2, showing the hinge plate, paratype USNM 154819c [Bone Spring Forma? tion, 728f.] Pontisia franklinensis, new species: 64, 65, Ventral, posterior, side, anterior, and dorsal views, XI, paratypes USNM 152846c, b; 66-69, ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, side, and anterior views, X2, holotype USNM 152846a; 70, anterior view of the interior, X3, showing the cardinalia, paratype USNM 152846f. [Alacran Mountain Formation, USNM 712m.] NUMBER 21 2341 PLATE 529.?Anteridocus, Pontisia, and Antronaria. 2 3 4 2 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 530 Antronaria and Pontisia Antronaria emarginata, new species: 1-5, Posterior, anterior, side, ventral, and dorsal views, XI, paratype USNM 152844. [Skinner Ranch Formation (Decie Ranch Member), USNM 707a.] 6-10, Dorsal, ventral, posterior, anterior, and side views, XI, paratype USNM 148662. [Skinner Ranch Formation (Sullivan Peak Member), USNM 707.] 11-15, Anterior, dorsal, side, posterior, and ventral views, XI, holotype USNM 154838a. [Skinner Ranch Formation (Decie Ranch Member), USNM 727u.] Pontisia kingi, new species: 16, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 152848a; 17, 18, ventral, posterior, side, anterior, and dorsal views, XI, and anterior view, X2, holotype USNM 152848b. [Neal Ranch Formation (bed 4), USNM 72lg.] 19-22, Posterior, anterior, side, ventral, and dorsal views, XI, and side, dorsal, and anterior views, X2, paratype USNM 148593d; 28-30, interior and posteriorly and laterally tilted views, X3, showing the cardinalia, paratype USNM 154836b; 31, interior of the pedicle valve, X3, showing the teeth, paratype USNM 154836a; 32, interior and posteriorly tilted views of the posterior of a brachial valve, X3, showing the cardinalia, paratype USNM 154836d. [Neal Ranch Formation (bed 4), USNM 701d.] 23, Posterior, anterior, side, ventral, and dorsal views, XI, paratype USNM 148598; 24, interior of the pedicle valve, X1.5, paratype USNM 148597; 25, 26, interior and laterally tilted views, X3, of the brachial valve of the preceding specimen; 27, dorsal, anterior, and side views of the preceding specimen, XI. [Neal Ranch Formation (bed 4), USNM 701-1.] Pontisia longicosta (Stehli): 33-36, Ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, side, and anterior views, X3, hypotype USNM 154835a; 37-39, ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, anterior, and side views, X3, hypotype USNM 154835b; 40, interior of the pedicle valve, X3, showing disjunct deltidial plates, hypotype USNM 154835c; 41, posteriorly tilted view of the pedicle valve interior, X6, showing dental plates and disjunct deltidial plates, hypotype USNM 154835f; 42-44, posteriorly tilted, interior, and laterally tilted views of the brachial valve, X6, showing hinge plate, hypotype USNM 154835d; 45, anterior view of another brachial valve, X6, showing the cardinalia, hypotype USNM 154835c [Bone Spring Formation, USNM 728f.] NUMBER 21 2343 PLATE 530.?Antronaria and Pontisia. 2344 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 531 Antronaria and Pontisia Pontisia magnicostata, new species: 1-5, Dorsal, posterior, side, anterior, and ventral views, XI, holotype USNM 152850a; 6-8, interior, laterally tilted, and anterior views of the brachial valve interior, X2, showing undivided hinge plate and thick, low median ridge, paratype USNM 152850c. [Neal Ranch Formation (beds 9-12 of Cooper), USNM 722w.] Antronaria indentata, new species: 9-13, Posterior, anterior, side, ventral, and dorsal views of a complete specimen, XI, holotype USNM 154839a; 14-18, posterior, anterior, ventral, dorsal, and side views of an obese specimen, XI, hypotype USNM 154839b; 19, 20, interior of the pedicle valve, Xl.5, X2, showing teeth and disjunct deltidial plates, hypotype USNM 152851a; 21, 22, interior of the brachial valve, XI, X2, paratype 152851c; 23, 24, anterior view of the interior, XI, X2, showing the long crura, hypotype USNM 152851b. [Bone Spring Formation, USNM 725c] Antronaria mesicostalis (Girty): 25-29, Dorsal, posterior, side, anterior, and ventral views, XI, hypotype USNM 154840. [Bone Spring Formation, AMNH 697]. 30-34, Dorsal, posterior, side, anterior, and ventral views, XI, lectotype USNM 152852a. [Bone Spring Formation, North Apache Canyon, Diablo Plateau, Texas.] 35, 36, Posteriorly tilted and interior views, X2, of the brachial valve, hypotype USNM 154841a; 37, 38, interior of another brachial valve, XI, X2, showing muscle scars and cardinalia, hypotype USNM 154841b. [Bone Spring Formation, AMNH 625-] Pontisia nanas (Stehli): 39, 52, Ventral, posterior, side, anterior and dorsal views, XI, and dorsal view, X3, hypotype USNM 154842a; 40?13, ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, side, and anterior views, X3, hypotype USNM 154842c; 44-47, ventral, posterior, side, anterior, and dorsal views, XI, and side, anterior, and dorsal views, X3, hypo? type USNM 154842d; 48, 49, posteriorly tilted view, X2, and interior views, X4, of the pedicle valve, showing dental plates and disjunct deltidial plates, hypotype USNM 154842e; 50, 51, interior and ventral views of the brachial valve interior, X4, showing hinge plate and crus, hypotype USNM 154842f; 53-55, laterally tilted, posteriorly tilted, and interior views of another brachial valve, X4, showing cardinalia, hypotype USNM 154842g; 56, interior of another brachial valve, X6, hypotype USNM 154842h; 57, anterior view of the interior, X6, showing the long crura, hypotype USNM 154842i; 58, anterior view of a brachial valve interior, X4, hypo? type USNM 154842J. [Bone Spring Formation, USNM 728L] NUMBER 21 2345 PLATE 531.?Antronaria and Pontisia. 2 3 4 6 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 532 Antronaria Antronaria specialis, new species: 1-5, Posterior, anterior, side, ventral, and dorsal views, XI, paratype USNM 154843a; 6-10, posterior, side, anterior, ventral and dorsal views, XI, paratype USNM 152856d; 11-15, posterior, anterior, ventral, side, and dorsal views, XI, holotype USNM 152856f; 16-18, anterior, side, and dorsal views, XI, of a large specimen, paratype USNM 152856g; 19, posterior view, X4, showing foramen and conjunct deltidial plates, paratype USNM 152856d; 20, posterior view of a broken specimen, X2, showing the long crura, paratype USNM 154843b; 21, anterior view of the interior, X3, showing cardinalia, paratype USNM 154845f; 22, lateral view of another specimen, X2, showing the crura, paratype USNM 154843c; 23, dorsal views, XI, immature paratypes USNM 154844b-g. [Bone Spring Formation, AMNH 492.] Antronaria speciosa, new species: 24, 25, Ventral, posterior, side, anterior, and dorsal views, XI, immature paratypes USNM 154847a, b; 31-35, ventral, posterior, side, anterior, and dorsal views, XI, of an immature specimen, paratype USNM 148682d; 36-40, ventral, posterior, side, anterior, and dorsal views, XI, of a young adult, paratype USNM 148682f; 41-45, dorsal, posterior, anterior, side, and dorsal views of an adult, XI, paratype USNM 154847c; 46-50, posterior, anterior, ventral, side, and dorsal views, XI, of the holotype USNM 154847d; 51, 52, interior of the pedicle valve, XI, X3, showing dental plates and conjunct deltidial plates, para? type USNM I54847e; 53-55, laterally tilted and interior views, XI, and interior views, X3, of a brachial valve, showing hinge plate and crura, paratype USNM 154847f; 59, 60, laterally tilted and interior views of a brachial valve, X3, showing the cardinalia, paratype USNM 154846; 61, anterior view of the interior, X3, showing crura, paratype USNM 154847h. [Hess Formation (Taylor Ranch Member), USNM 702d.] 26-30, Posterior, side, ventral, anterior, and dorsal views of a large adult, XI, paratype USNM 148686. [Skinner Ranch Formation (Sullivan Peak Member), USNM 729h.] 56-58, Interior and laterally tilted views, X3, and interior view, XI, of a brachial valve, paratype USNM 148688. [Hess Formation (Taylor Ranch Member), USNM 702c] NUMBER 21 2347 PLATE 532.?Antronaria. 2348 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 533 Antronaria and Pontisia Antronaria spectabilis, new species: 1-5, Posterior, anterior, side, ventral, and dorsal views, XI, paratype USNM 152857d; 6, interior view, XI, of the pedicle valve, showing dental plates and conjunct deltidial plates, paratype USNM 154854a (see also figure 34); 17-21, posterior, anterior, side, ventral, and dorsal views of a large adult, XI, paratype USNM 152857g; 22-26, posterior, anterior, ventral, side, and dorsal views of a large individual, XI, holotype USNM 152857i; 27, interior of another pedicle valve, XI, paratype USNM 154854b; 28-30, interior view, XI, and interior and laterally tilted views, X2, showing the hinge plate, paratype USNM 154854c; 31-33, posteriorly tilted, interior, and laterally tilted views of another brachial valve, XI, paratype USNM 154854d; 34, posterior view of the pedicle valve beak (see figure 6), X3, showing fused deltidial plates, paratype USNM 154854a; 35-38, interior view, XI, and interior, laterally tilted, and posteriorly tilted views, X3, of a large brachial valve showing hinge plate and crura, para? type USNM 154854c [Bone Spring Formation, USNM 728g.] 7-11, Posterior, anterior, side, ventral, and dorsal views, XI, paratype USNM 152858b; 12, interior of the brachial valve, XI, paratype USNM 154853a; 13, 14, posteriorly tilted and interior views, XI, of another brachial valve, paratype USNM 154853b; 15, 16, posteriorly tilted and interior views of two pedicle valves, XI, paratypes USNM 154853c, d. [Bone Spring Forma? tion, USNM 728f.] Pontisia stehlii stehlii Cooper and Grant: 39, Dorsal and anterior views, XI, immature hypotypes USNM 1538351, b-e; 40, ventral, anterior, side, and dorsal views of two young adults, XI, hypotypes USNM 153835f, g; 41-45, posterior, anterior, ventral, side, and dorsal views of a young adult, XI, hypotype USNM 1487l0h; 46-50, posterior, ventral, dorsal, side, and anterior views of a fully grown specimen, XI, hypotype USNM 1487lOi; 51-55, posterior, anterior, side, dorsal, and ventral views of a large adult, XI, hypotype USNM 153835h; 56-60, ventral, pos? terior, side, anterior, and dorsal views, XI, of another old adult, holotype USNM 153835a. [Road Canyon Formation, USNM 702c] NUMBER 21 2349 PLATE 533.?Antronaria and Pontisia. ^ mb ^ ^>; 57 ? 59 60 2350 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 534 Pontisia and Anteridocus Pontisia stehlii stehlii Cooper and Grant: 1-5, Posterior, anterior, side, ventral, and dorsal views, XI, hypotype USNM 154851a; 6-10, posterior, anterior, side, dorsal and ventral views of a strongly costate individual, XI, hypotype USNM 154851b. [Road Canyon Formation, USNM 72 lo.] 11-15, Posterior, anterior, side, ventral, and dorsal views, XI, hypotype USNM 154850a. [Road Canyon Formation, USNM 721s.] 16-20, Posterior, ventral, side, dorsal, and anterior views of a rotund specimen, XI, hypotype USNM 154849. [Cathedral Mountain Formation, USNM 702a.] 21-25, Dorsal, posterior, anterior, ventral, and side views, XI, hypotype USNM 154852a; 26-30, ventral, posterior, side, anterior, and dorsal views of a large individual, XI, hypotype USNM 154852b; 39-41, interior, laterally tilted, and posteriorly tilted views of a brachial valve, X1.5, hypotype USNM 154852c; 42, 43, laterally tilted and anterior views of the preceding brachial valve, X3, showing the hinge plate and crura. [Road Canyon Formation, USNM 719x.] 31, Interior of a brachial valve, X3, hypotype USNM 153835m; 32, interior of an immature brachial valve, X3, hypotype USNM 153835n; 33, interior and posteriorly tilted views of another immature brachial valve, X3, hypotype USNM 153835o; 34, 35, posteriorly tilted and interior views of another immature brachial valve, X8, showing beginnings of hinge plate, hypotype USNM 153835p; 36, 37, posteriorly tilted and interior views of a brachial valve, X3, showing the crura, hypotype USNM 154848e; 38, interior of an immature brachial valve, X6, showing crura and hinge plate, hypotype USNM 153835r; 44, side view of a broken specimen, X1.5, hypotype USNM 154848a; 45, 46, posterior, and posteriorly tilted views of the beak of the pedicle valve, X4, showing the conjunct deltidial plates, hypotype USNM 154848b; 47, 48, interior and posteriorly tilted views of a brachial valve, XI.5, showing hinge plate and crura, hypotype USNM 154848c; 49, interior view of the preceding brachial valve, X4.5, showing elements of the hinge plate and the minutely crenulated socket. [Road Canyon Formation, USNM 702c] Anteridocus swallovianus (Shumard): 50, 51, Ventral, posterior, side, anterior, and dorsal views, XI, showing flattened brachial valve umbo, hypotypes USNM 154855a, b (for enlarged views see Plate 538: figures 1-3); 62, 63, anterior and tilted views of the interior, X3, showing the crura, hypotype USNM 154855d; 64, broken specimen, X4, showing hinge plate and crura, hypotype USNM 154855c [Bell Canyon Formation (Hegler Member), USNM 731.] 52, Ventral, posterior, side, anterior, and dorsal views, XI, hypotype USNM 154856. [Capitan Formation, AMNH 840.] 53, Ventral, posterior, side, anterior, and dorsal views, XI, hypotype USNM 154929 (for enlarged view see Plate 538: figures 4-6). [Bell Canyon Formation (Pinery Member), USNM 725h.] 54, Ventral, posterior, side, anterior, and dorsal views, XI, hypotype USNM 154859d. [Capitan Formation, USNM 740.] 55, Ventral, posterior, side, anterior, and dorsal views, XI, hypotype USNM 154857. [Capitan Formation, USNM 725-1.] 56-58, Anterior, side, and dorsal views, XI, hypotype USNM 154858. [Capitan Formation, USNM 750a.] 59-61, Ventral, posteriorly tilted, and laterally tilted views of a specimen, X3, showing the long crura and hinge plate, hypotype USNM 154860b. [Bell Canyon Formation (Pinery Member), USNM 725n.] NUMBER 21 2351 PLATE 534.?Pontisia and Anteridocus. ft 0* W 2352 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 535 Anteridocus, Antronaria, and Pontisia Anteridocus paucicostatus, new species: 1, Ventral, posterior, side, anterior, and dorsal views, XI, jjaratype USNM 148590a; 2-5, ventral, posterior, side, anterior, and dorsal views, XI, and side, anterior, and dorsal views, X2, paratype USNM 148590b; 6, interior of the brachial valve, X4, paratype USNM 148590c [Skinner Ranch Formation (Sullivan Peak Member), USNM 7l4y.] Antronaria pluricosta, new species: 7-11, Posterior, anterior, side, dorsal, and ventral views, XI, paratype USNM 152854c; 12-16, ventral, side, dorsal, posterior, and anterior views, XI, paratype USNM 152854b; 17-21, posterior, anterior, side, dorsal, and ventral views, XI, holotype USNM 152854d; 22, anterior view of the interior, X2, showing the cardinalia, paratype USNM 152854i; 23-25, posteriorly tilted, interior, and laterally tilted views, X2, showing median ridge, muscle field, and hinge plate, paratype USNM 152854k. [Bone Spring Formation, AMNH 591.] Anteridocus seminudus, new species: 26, 27, Ventral, posterior, side, anterior, and dorsal views, XI, paratypes USNM 152855f, g; 28-31, ventral, posterior, side, anterior, and dorsal views, XI, and side, anterior, and dorsal views, X3, holotype USNM 152855h; 32, 33, ventral view of the interior, X2, X6, showing the crura and hinge plate, paratype USNM 154864a; 34, 35, interior of the pedicle valve, X2, X4, showing incipient deltidial plates, paratype USNM 154864b; 36-38, interior, laterally tilted, and posteriorly tilted views of another brachial valve, X6, showing hinge plate, crura, and lack of a median septum, paratype USNM 154864c [Road Canyon Formation, USNM 722f.] 39-42, Ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, anterior, and side views, X2, paratype USNM 154863a; 43-46, ventral, posterior, side, anterior, and dorsal views, XI, and anterior, dorsal, and side views, X2, paratype USNM 154863b; 47, ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 154863c; 48, 49, posteriorly tilted and interior views of the brachial valve, X6, lacking a median septum, paratype USNM 154863d; 50, 51, posteriorly tilted view, X2, X4, showing the dental plates and incipient deltidial plates, paratype USNM 154863c [Road Canyon Formation, USNM 721x.] Pontisia stehlii tumidosa, new subspecies: 52-56, Side, posterior, anterior, dorsal, and ventral views, XI, holotype USNM 148623h; 57-61, posterior, anterior, side, ventral, and dorsal views of a complete specimen, XI, paratype USNM 148623g; 62, 63, ventral, posterior, side, anterior and dorsal views, XI, of two small paratypes, USNM 148623b, c; 64, 65, interior and posteriorly tilted views of the brachial valve, X3, showing the cardinalia, paratype USNM 154682a; 66, anterolateral view of the interior, X3, showing the crura paratype USNM 154682b. [Road Canyon Formation, USNM 702c] NUMBER 21 2353 PLATE 535.?Anteridocus, Antronaria, and Pontisia. 2354 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 536 Antronaria and Pontisia Antronaria transversa (R. E. King): 1-5, Posterior, anterior, side, ventral, and dorsal views, XI, hypotype USNM 148645e; 6-9, dorsal, side, anterior, and ventral views of an immature individual, XI, hypotype USNM 148645a. [Hess Formation (Taylor Ranch Member), USNM 702d.] 10-14, Anterior, posterior, side, ventral, and dorsal views, XI, hypotype USNM 148651a; 25, 26, specimen with beak broken away to show cardinalia, XI, X3, hypotype USNM 154865a; 27, posterior of another brachial valve, X3, showing crura, hypotype USNM 154865b. [Hess Forma? tion (Taylor Ranch Member), USNM 702c] 15-19, Anterior, dorsal, side, posterior, and ventral views of a. large specimen, XI, hypotype USNM 154932. [Hess Formation (Taylor Ranch Member), USNM 7l6o.] 20-24, Ventral, anterior, dorsal, posterior, and side views of another large individual, XI, hypotype USNM 148668a. [Hess Formation (Taylor Ranch Member), USNM 7l6n.] Pontisia ventricola, new species: 28, Dorsal view of an immature specimen, XI, paratype USNM 152860b; 29-31, ventral, posterior, side, anterior and dorsal views, XI, young paratypes USNM 152860d, h, j ; 32-34, ventral, posterior, side, anterior, and dorsal views, XI, and side and dorsal views, X2, paratype USNM 152860k; 35, posterior of the preceding specimen, X4, showing conjunct deltidial plates; 36, 37, ventral, posterior, side, anterior, and dorsal views, XI, holo? type USNM 152860m (for enlarged views see plate 520: figures 51-53) and paratype USNM 152860s; 38, anterolateral view of the interior, X3, showing the crura, paratype USNM 154866a; 39, 40, interior and posteriorly tilted view of the pedicle valve, X1.5, showing the dental plates, paratype USNM 154866b; 41, 42, posteriorly tilted and interior views of the preceding pedicle valve, X3, showing dental plates and disjunct deltidial plates; 43, 44, interior and posteriorly tilted views of the brachial valve, X3, showing absence of median septum, the hinge- plate, and crura, paratype USNM 154866c; 45-48, interior, X1.5, and anteiior, interior, and laterally tilted views, X3, of a brachial valve, showing cardinalia, paratype USNM 154866d; 49, posterior of the preceding specimen, X4, showing the hinge plate; 50, 51, interior of another specimen showing hinge plate and crura and absence of median septum, X4, paratype USNM 154866c [Hess Formation (top), USNM 726n.] NUMBER 21 2355 PLATE 536.?Antronaria and Pontisia. # a* $ rflfc 41 2 3 5 6 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 537 Antronaria Antronaria voluminosa, new species: 1, 2, Ventral, anterior, side, and dorsal views, XI, immature paratypes USNM 148736b, d; 3-7, dorsal, ventral, side, anterior, and posterior views, XI, of a young paratype USNM 148736f; 8-12, dorsal, ventral, side, anterior, and posterior views of a specimen more mature than the preceding, XI, paratype USNM 148736g; 13-17, dorsal, ventral, side, anterior, and posterior views of a young adult, XI, paratype USNM 148736i; 18-22, pos? terior, anterior, side, ventral, and dorsal views of a very large individual, XI, holotype USNM 148736-1; 28-32, posterior, side, anterior, dorsal, and ventral views of a complete specimen, XI, paratype USNM 154868a; 33-37, ventral, posterior, side, anterior, and dorsal views of a large specimen, XI, paratype USNM 154868b. [Skinner Ranch Formation (Poplar Tank Member), USNM 708c] 23-27, posterior, dorsal, side, ventral, and anterior views of a complete specimen, XI, para? type USNM 148742. [Skinner Ranch Formation (Decie Ranch Member), USNM 707a.] 38, Anterolateral view of the interior, X2, showing crura, paratype USNM 154869a; 39, interior of the pedicle valve, XI, paratype USNM 154869b; 40, anterior view of the interior, X2, showing short median ridge and crus, paratype USNM 154869c; 41-43, interior, posteriorly tilted, and side views of a brachial valve, XI, showing crura and hinge plate, paratype USNM 154870; 44-46, same views as the preceding, X2, showing greater detail; 47, interior of the pedicle valve of the preceding specimen, X2, showing dental plates and muscle field; 48, 49, interior and laterally tilted views of a brachial valve, XI, showing hinge plate and crura, para? type USNM 154869d; 50, 51, same views as preceding, X2. [Skinner Ranch Formation (Sullivan Peak Member), USNM 707-1.] NUMBER 21 2357 PLATE 537.?Antronaria. 2 3 5 8 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 538 Anteridocus and Antronaria Anteridocus swallovianus (Shumard): 1-3, Dorsal, anterior, and side views of a complete speci? men, X2, showing flattened dorsal umbo, hypotype USNM 154855b (for natural size views, see Plate 534: figures 50-51). [Bell Canyon Formation (Hegler Member), USNM 731.] 4-6, Side, anterior, and dorsal views of another complete specimen, X2, hypotype USNM 154859d (for natural size views see Plate 534: figure 54); 7, posterior of the preceding specimen, X4, showing the conjunct deltidial plates. [Bell Canyon Formation (Pinery Member), USNM 725h.] 8, Interior of the brachial valve, X4, hypotype USNM 154861a. [Bell Canyon Formation (Lamar Member), USNM 738.] 9, 10, Posteriorly tilted and interior views of the pedicle valve, X1.5, showing a trace of pallial marks, hypotype USNM 154860a; 11, side view, showing the crura, X3, hypotype USNM 154860d. [Bell Canyon Formation (Pinery Member), USNM 725n.] Antronaria titania, new species: 12-16, Anterior, posterior, side, ventral, and dorsal views of a complete specimen, XI, paratype USNM 154873. [Skinner Ranch Formation (base), USNM 720c] 17-21, Ventral, side, dorsal, posterior, and anterior views of a complete specimen, XI, paratype USNM 154874. [Skinner Ranch Formation (Decie Ranch Member), USNM 727u.] 22-26, Ventral, dorsal, side, posterior, and anterior views of a large specimen, XI, paratype USNM 154872a; 37, interior of the brachial valve, X2, paratype USNM 154872b. [Skinner Ranch Formation (base), USNM 705a.] 27-31, Side, ventral, anterior, posterior, and dorsal views of a large complete specimen, XI, paratype USNM 154871; 32-36, posterior, anterior, side, ventral, and dorsal views of a large adult, XI, holotype USNM 148660J. [Skinner Ranch Formation (Decie Ranch Member), USNM 707a.] Antronaria transversa (R. E. King): 38-42, Ventral, anterior, side, posterior, and dorsal views, of a young specimen, XI, paratype YPM 12519. [Hess Formation (Taylor Ranch Member), R. E. King 212.] 43-47, Dorsal, anterior, ventral, posterior, and side views, XI, of another paratype YPM 10674. [Hess Formation (Taylor Ranch Member), R. E. King locality 107.] 48-52, Posterior, dorsal, anterior, side, and ventral views, XI, holotype YPM 12518. [Hess Formation (Taylor Ranch Member), R. E. King 222.] Anteridocus gongylus, new species: 53, Anterior view, X6, showing the hinge plate and crura, paratype USNM 154875a; 54, dorsal view of the interior, X6, showing under side of hinge plate and crura, paratype USNM 154875b; 55, ventral view of another specimen, X6, showing the crura, paratype USNM 154875c; 56, ventral view of the interior, X4, showing cardinalia, paratype USNM 154875d; 57, interior of a brachial valve, X6, showing hinge plate and crura, paratype USNM 154875c; 58, interior of another brachial valve, X4, showing hinge plate and crura, paratype USNM 154875f (for additional and exterior views of this species see plate 539). [Cathedral Mountain Formation, USNM 702a.] NUMBER 21 2359 PLATE 538.?Anteridocus and Antronaria. 2360 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 539 Hemileurus and Anteridocus Hemileurus runcinatus, new species: 1, 2, Ventral, posterior, side, anterior, and dorsal views, XI, young paratypes USNM 148071i, g; 3, ventral, posterior, side, anterior, and dorsal views of an adult, XI, holotype USNM 14807lh; 4, broken specimen, X4, showing crura and absence of inner hinge plates, paratype USNM 148071-1; 5, another broken specimen, X4, showing the same features as the preceding, paratype USNM 148071k; 6, ventral view, X4, showing the crura, paratype USNM 148071J. [Neal Ranch Formation (beds 12-14 of P. B. King), USNM 701k.] 7, 8, Ventral, posterior, side, anterior, and dorsal views, XI, of two paratypes USNM 154876a, c. [Neal Ranch Formation (beds 12-14 of P. B. King), USNM 701h.] Anteridocus erugatus, new species: 9, Dorsal view of a complete but immature specimen, X2, paratype USNM 154877a; 10, ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 154878a; 11-14, ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, anterior, and side views, X2, holotype USNM 154878b; 15-18, ventral, posterior, side, anterior, and dorsal views, XI, and anterior, dorsal, and side views, X2, paratype USNM 154878c; 23-25, posteriorly tilted and interior views, X2, and posterior, X6, showing dental plates and incipient deltidial plates, paratype USNM 154877b; 26, 27, dorsal view of the interior, X2, X6, showing underside of hinge plate and crura, paratype USNM 154877c; 28-30, interior view, X2, and laterally tilted and posterior views, X6, of the brachial valve, showing the long, curved crura and slight development of inner hinge plates, paratype USNM 154877d; 31, 32, dorsal view of the interior, X2, X6, showing underside of crura, paratype USNM 154877e; 33, posterior part of the brachial valve with part of pedicle valve attached, X8, showing cardinalia, dental plates, and a fused hinge plate, paratype USNM 154877f; 34, 35, interior view of the brachial valve, X2, X6, showing strongly developed and nearly coalesced inner hinge plates, paratype USNM 154877g; 36, interior of another brachial valve with beak of pedicle valve attached, X6, showing dental plates and coalesced inner hinge plates, paratype USNM 154877h; 37-39, interior view, X2, and interior and laterally tilted views, X6, of a brachial valve with fused hinge plate and stout crura, paratype USNM 1548771. [Road Canyon Formation, USNM 702c] 19-22, Posterior, anterior, side, ventral, and dorsal views, XI, and side, anterior, and dorsal views, X2, of a complete specimen, paratype USNM 148123a. [Cathedral Mountain Formation, USNM 708.] Anteridocus gongylus, new species: 40, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 154879a; 41-44, ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, anterior, and side views, X2, of another paratype USNM 154879b. [Cathedral Mountain Formation, USNM 708.] 45, Dorsal view of an immature, complete specimen, XI, paratype USNM 1548751; 46, ventral, posterior, side, anterior, and dorsal view of another immature specimen, XI, paratype USNM 154875J; 47-50, ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, anterior, and side views, X2, of a complete specimen, paratype USNM 154875-1; 51-54, ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, side, and anterior views, X2, of another para? type USNM 154875k; 55, ventral, posterior, side, anterior and dorsal views, XI, of a complete specimen, paratype USNM I48105f; 56-59, ventral, posterior, side, anterior and dorsal views, XI, and side, anterior and dorsal views, X2, of another paratype USNM 148105g. [Cathedral Mountain Formation, USNM 702a.] NUMBER 21 2361 PLATE 539.?Hemileurus and Anteridocus. 10 11 15 ^ 4? I A ^ 40 45 41 4 & fc 42 43 44 A - < * * ^ to W to to 51 A J 52 53 .Jk 48 I 54 49 57 ^ ^ 58 ^ ^ 5 9 56 #? #? t' to 0 55 2362 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 540 Anteridocus, Allorhynchus, and Petasmatherus Anteridocus eximius, new species: 1, 2, Ventral, posterior, side, anterior, and dorsal views, XL of paratype USNM 154880f and holotype USNM 154880d; 3, interior of the brachial valve, X3, paratype USNM 154880g. [Bone Spring Formation (Cutoff Member), AMNH 678.] Allorhynchus formulosum, new species: 4-8, Ventral, posterior, side, anterior, and dorsal views, XI, and anterior, posterior, dorsal, and side views, X2, holotype USNM 154881a; 9, ventral, posterior, side, anterior, and dorsal views of an adult, XI, paratype USNM 154882h; 10-12, anterior, side, and dorsal views, X2, of another paratype USNM 154882g; 13, interior of the brachial valve, X3, paratype USNM 154881c; 14, interior of the pedicle valve, X3, showing incipient deltidial plates, paratype USNM 154881d. [Cherry Canyon Formation (Getaway Mem? ber), AMNH 585.] Petasmatherus mundus, new species: 15, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 153472c; 16-21, ventral, posterior, side, anterior, and dorsal views, XI, and posterior, anterior, side, dorsal, and ventral views, X3, holotype USNM 153472a; 22, interior of the brachial valve, X3, paratype USNM 153472d; 23-25, laterally tilted, interior, and pos? teriorly tilted views, X9, showing the divided hinge plate, of the preceding specimen. [Cathedral Mountain Formation, USNM 702-low.] Petasmatherus nitidus, new species: 26-30, Ventral, posterior, side, anterior, and dorsal views, XI, and posterior, side, dorsal, and anterior views, X3, paratype USNM 154883a; 31, 32, ventral, posterior, side, anterior, and dorsal views, XI, paratypes USNM 154883b, j ; 49, broken specimen, showing the divided hinge plate, X4, paratype USNM 154883k. [Road Canyon Formation, USNM 721x.] 33, 34, 40, ventral, posterior, side, anterior, and dorsal views of two immature and one adult specimen, XI, paratypes USNM 154884a, b, g; 35-39, ventral, posterior, side, anterior, and dorsal views, XI, and anterior, posterior, dorsal, and side views, X3, holotype USNM 154884h; 51, 52, interior and laterally tilted views, X6, showing divided hinge plate, median ridge, and crura, paratype USNM 154884c; 53, interior of another brachial valve, X6, paratype USNM 154884d; 54, ventral view of the interior, X6, paratype USNM 154884f; 55, posterior of pedicle valve, showing disjunct deltidial plates, X6, paratype USNM 154884c [Road Canyon Formation, USNM 72lj.] 41-45, Posterior, anterior, side, ventral, and dorsal views, XI, and dorsal, side, posterior, and anterior views, X3, paratype USNM 154885a; 46, 47, posteriorly tilted and interior views, X2, of the pedicle valve, paratype USNM 154885b; 48, posteriorly tilted view of the preceding pedicle valve, X3, showing dental plates and disjunct deltidial plates; 50, interior of a brachial valve, X2, paratype USNM 154855c [Road Canyon Formation, USNM 721z.] NUMBER 21 2363 PLATE 540.?Anteridocus, Allorhynchus, and Petasmatherus. 2364 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 541 Allorhynchus, Petasmatherus, and Phrenophoria Allorhynchus permianum permianum Stehli: 1-5, Posterior, anterior, side, ventral, and dorsal views, XI, hypotype USNM 148054a; 6-10, posterior, anterior, side, ventral, and dorsal views, XI, hypotype USNM 148054b; 11-15, ventral, posterior, side, dorsal, and anterior views of a young adult, XI, hypotype USNM 148054c; 16-20, ventral, dorsal, side, posterior, and anterior views of another young adult, XI, hypotype USNM 1148054d; 21, 22, posteriorly tilted and interior views of the pedicle valve, X1.5, showing dental and disjunct deltidial plates, hypo? type USNM 148054e; 23, interior of a brachial valve, X1.5, showing divided hinge plate, hypo? type USNM 148054f; 24, 25, posteriorly tilted and interior views of the preceding specimen, X4.5, showing inner hinge plates, crura, and threadlike median ridge; 26, broken specimen, X1.5, showing cardinalia, hypotype USNM 148054g; 27, interior of another brachial valve, X1.5, hypotype USNM 148054h; 28, 29, laterally tilted and posteriorly tilted views of the preceding specimen, X3, showing cardinalia; 30, interior of the preceding specimen, X4.5, showing cardinalia. [Cherry Canyon Formation (Getaway Member), USNM 728.] Petasmatherus pumilus, new species: 31-35, Side, anterior, ventral, and dorsal views, XI, and ventral, anterior, posterior and side views, X2, paratype USNM 148063a. [Road Canyon For? mation, USNM 706f.] 36^0, Posterior, anterior, side, ventral, and dorsal views, XI, and dorsal, anterior, side, and posterior views, X3, paratype USNM 154886. [Road Canyon Formation, USNM 721].] 41, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM I48061d; 42-46, ventral, posterior, side, anterior, and dorsal views, XI, and posterior, dorsal, anterior, and side views, X2, paratype USNM 148061g; 47-51, ventral, posterior, side, anterior, and dorsal views, XI, and side, posterior, anterior, and dorsal views, X2, of a bored specimen, holotype USNM 148061e; 52, dorsal views of two immature individuals, XI, paratypes USNM 148061h, i; 53, interior of the pedicle valve, X6, showing disjunct deltidial plates, paratype USNM 148061 j ; 54, 55, interior and laterally tilted views of a brachial valve, X6, showing divided hinge plate, paratype USNM 148061k; 56, interior of another brachial valve, X6, showing divided hinge plate, paratype USNM 148061-1. [Road Canyon Formation, USNM 707c] Petasmatherus cf. P. pumilus, new species: 57, 58, Ventral, posterior, side, anterior, and dorsal views, X2, and dorsal views, XI, figured specimens USNM 154887b, a. [Cibolo Formation (Thin-bedded Zone of Udden), USNM 738-1.] Phrenophoria vetula, new species: 59, Dorsal view of a complete specimen, XI, paratype USNM 154888; 60, 61, exterior and interior of the brachial valve of the preceding specimen, X2; 62, 63, interior and exterior of the pedicle valve of the preceding specimen, X2. [Cathedral Moun? tain Formation, USNM 721u.] NUMBER 21 2365 PLATE 541.?Allorhynchus, Petasmatherus, and Phrenophoria. 52 33 * i l l * . " 51 2366 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 542 Allorhynchus Allorhynchus permianum wordense, new subspecies: 1, Dorsal view of two immature specimens, XI, paratypes USNM 154889a, b; 2, 3, ventral, posterior, side, anterior, and dorsal views, XI, of two young individuals, paratypes USNM 148084e, f; 4-8, posterior, anterior, side, ventral, and dorsal views, XI, of a large adult, paratype USNM 148084g; 9-13, ventral, dorsal, side, posterior, and anterior views, XI, of a complete specimen, holotype USNM 154889c; 36-38, interior and posteriorly tilted views, X1.5, and interior view, X3, of the pedicle valve, showing disjunct deltidial plates, paratype USNM 154889d; 39, 40, dorsal view of another interior, X1.5, X3, showing underside of crura, paratype USNM 154889e; 41-43, interior, laterally tilted, and pos? teriorly tilted views of a brachial valve, X1.5, showing the divided hinge plate, paratype USNM 154889f; 44, posterior of the preceding specimen, X3, showing the divided hinge plate; 47, anterolateral view of another interior, X4, showing the crura, paratype USNM 154889h. [Word Formation (Willis Ranch Member), USNM 706.] 14-18, Posterior, side, anterior, ventral, and dorsal views of a young adult, XI, paratype USNM 154890a; 19-23, ventral, dorsal, side, posterior, and anterior views of an immature specimen, XI, paratype USNM 154890b; 48, ventral view of a broken specimen, X3, showing the cardinalia, paratype USNM 154890c; 49, interior of the brachial valve, X3, showing the divided hinge plate and also small inner hinge plates, paratype USNM 154890d. [Word Forma? tion (lens between the Willis Ranch and Appel Ranch members), USNM 706b.] 24-28, Ventral, posterior, side, anterior, and dorsal views of an average adult, XI, paratype USNM 148081a; 29-33, posterior, side, anterior, ventral, and dorsal views of a young adult, XI, paratype USNM 148081b; 34, 35, dorsal, anterior, and side views of two immature specimens, XI, paratypes USNM 148081c, d; 45, 46, interior of the brachial valve, X1.5, X3, showing divided hinge plate and inner hinge plates, paratype USNM 148081e; 50, 51, interior, XI, and posterior, X3, of the pedicle valve showing disjunct deltidial plates, paratype USNM 148081e (counterparts of the same specimen). [Word Formation (Willis Ranch Member), USNM 706c] Allorhynchus triangulatum, new species: 52-54, Ventral, posterior, side, anterior, and dorsal views, XI, paratypes USNM 148092d, e, c; 55, ventral, posterior, side, anterior, and dorsal views of the holotype, XI, USNM 148092b; 56, interior of the pedicle valve, X3, showing disjunct deltidial plates, paratype USNM 148092h; 57, 58, interior and posteriorly tilted views of the brachial valve, X1.5, paratype USNM 148092i; 59, 60, same views as preceding, ca.X5, showing divided hinge plate. [Word Formation (China Tank Member), USNM 706c] Allorhynchus venustulum, new species: 61, 62, Ventral, posterior, side, anterior, and dorsal views, X2, and dorsal view, XI, paratype USNM 154891a and paratype USNM 154891b; 63, interior of the pedicle valve, X4, showing teeth and disjunct deltidial plates, paratype USNM 154891c; 64, interior of the brachial valve, X6, showing divided hinge plate, well-developed inner hinge plates, and pallial marks, paratype USNM 15489Id. [Bell Canyon Formation (Lamar Member), USNM 728p.] NUMBER 21 2367 PLATE 542.?Allorhynchus. H m mt tP f^ 0 ft ? i m m n *1 m ? * # PI 0b 61 62 ?fi|(|# 2 3 6 8 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 543 Allorhynchus and Cenorhynchia Allorhynchus variabile, new species: 1, 2, Ventral, posterior, side, anterior, and dorsal views, XI, paratypes USNM 154892b, a. [Word Formation (Willis Ranch Member), USNM 706.] 3, Dorsal, anterior, and side views, XI, of two immature paratypes USNM 148090e, f; 4-6 ventral, posterior, side, anterior, and dorsal views, XI, of three adult paratypes USNM 148090d, c, b; 7, ventral, posterior, side, anterior, and dorsal views, XI, of the holotype USNM 148090a; 8, 9, posteriorly tilted and interior views of the brachial valve, X1.5, paratype USNM 148090g; 10, 11, same views, X3, showing the divided hinge plate with its inner hinge plates; 12, 13, interior view, X1.5, and posteriorly tilted view, X3, of the pedicle valve, showing disjunct deltidial plates, paratype USNM 148090h. [Word Formation (China Tank Member), USNM 706c] Allorhynchus venustulum, new species: 14, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 152804f; 15-19, ventral, posterior, side, anterior, and dorsal views, XI, and side, posterior, anterior, and dorsal views, X3, holotype USNM 152804g. [Bell Canyon Formation (Lamar Member), USNM 738b.] 20, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 154893a; 27, broken specimen, X6, showing the divided hinge plate, paratype USNM 154893b; 28, laterally tilted view of the brachial valve, X2, paratype 154893c; 29, 30, posteriorly tilted and interior views of the preceding specimen, X6, showing cardinalia; 31, 32, interior and posteriorly tilted views of the pedicle valve, X2, showing dental plates, paratype USNM 154893d; 33, interior of the preceding specimen, X4, showing disjunct deltidial plates. [Bell Canyon Formation (Lamar Member), USNM 738.] 21-25, Ventral, posterior, anterior, and dorsal views, XI, and side, dorsal, anterior and posterior views, X3, paratype USNM 154894. [Bell Canyon Formation (Lamar Member), AMNH 40.] 26, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 154895. [Bell Canyon Formation (Lamar Member), USNM 728r.] Cenorhynchia atmeta, new species: 34-37, Posterior, anterior, side, ventral, and dorsal views, X2, and dorsal, side, and anterior views, X4, paratype USNM 154896. [Road Canyon Forma? tion, USNM 72Io.] 38-41, Posterior, side, anterior, and dorsal views, X2, and dorsal view, XI, and anterior, side, and dorsal views, X4, holotype USNM I48162d; 42, posterior, side, anterior, and dorsal views, X2, and dorsal view, XI, paratype USNM 148162e; 47, posterior of pedicle valve, showing tooth and lack of deltidial plates, X10, paratype USNM 148162f; 48, interior of the brachial valve, showing hinge plate, X10, paratype USNM 148162h. [Road Canyon Formation, USNM 710u.] 43-46, Posterior, dorsal, XI, and anterior, ventral, side, and dorsal views, X2, and side, anterior, and dorsal views, X4, paratype USNM 154897a. [Road Canyon Formation (base), USNM 702c] 49, 50, Ventral, posterior, side, anterior, and dorsal views, X2, paratypes USNM 154898a, b. [Road Canyon Formation, USNM 724j.] NUMBER 21 2369 PLATE 543.?Allorhynchus and Cenorhynchia. 2 3 7 0 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 544 Cenorhynchia and Tautosia Cenorhynchia fracida, new species: 1, Dorsal, posterior, side, anterior, and posterior views, XI, paratype USNM 148167b; 2-5, ventral, posterior, side, anterior, and dorsal views, XI, and side, dorsal, and anterior views, X2, paratype USNM 148167d; 6-9, ventral, posterior, side, anterior, and dorsal views, XI, and anterior, side, and dorsal views, X2, holotype USNM 148167a; 10, II, interior view, X1.5, and interior tilted posteriorly, X3, showing dental plates and disjunct deltidial plates, paratype USNM 148168b; 12, ventral view of a broken specimen, X4, showing the hinge plate not quite coalesced and the long crura, paratype USNM 148168a; 13-15, laterally tilted, interior, and posteriorly tilted views of the brachial valve, X4, showing fused hinge plate and median septum, paratype USNM 148168c; 16, 17, interior and posteriorly tilted views of the preceding brachial valve, X1.5; 18-20, interior, laterally tilted, and anterior view, X4, of another brachial valve younger than the preceding with hinge plate not yet coalesced, para? type USNM 148168f; 21, interior of a young brachial valve, showing the fused hinge plate and long crura, X6, paratype USNM 148168g. [Word Formation (lens between Willis Ranch and Appel Ranch members), USNM 706b.] Cenorhynchia hebaia, new species: 22-25, Ventral, posterior, side, anterior, and dorsal views, XI, and anterior, side, and dorsal views, X3, paratype USNM 148185b; 26-29, ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, anterior, and side views, X3, holotype USNM 148185a; 30, 31, interior and posteriorly tilted views of a pedicle valve, X4, showing neither dental nor deltidial plates, paratype USNM 148185g; 32-34, interior, X1.5, of the brachial valve, and interior, and posteriorly tilted views, X5, of the same specimen, showing the hinge plate, paratype USNM 148185g; 35, 36, interior of brachial valve, X2, X6, showing hinge plate, paratype USNM 148185f; 37-40, interior posteriorly tilted view, X2, and posteriorly tilted, interior and laterally tilted views, X6, of a brachial valve, showing hinge plate and median septum, paratype USNM 148185c [Neal Ranch Formation (beds 12-14 of P. B. King), USNM 701k.] Tautosia distorta, new species: 41-45, Dorsal, anterior, posterior, side, and ventral views, XI, of an angular specimen, holotype USNM 153488a; 46, dorsal view of the preceding specimen, X2; 47, interior of the pedicle valve, X2, showing dental plates, paratype USNM 153488b. [Word Formation (Appel Ranch Member), USNM 727j.] NUMBER 21 2371 PLATE 544.?Cenorhynchia and Tautosia. 0k 0 m & 0 A * A A 0 2372 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 545 Cenorhynchia Cenorhynchia mitigata, new species: 1, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 148193e; 2-5, ventral, posterior, side, anterior, and dorsal views, XI, and anterior, dorsal, and side views, X2, paratype USNM 148193f; 6-9, ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, side, and anterior views, X2, holotype USNM 148193h; 20, anterior view, X4, showing the median septum and crura, paratype USNM 154901a; 21, interior of the pedicle valve tilted posteriorly to show the dental plates, X3, paratype USNM 154901b; 22, 23, posteriorly tilted and interior views of the brachial valve counterpart of the preceding, X4, showing a divided hinge plate and crura; 24, interior of preceding, XI.5. [Cathedral Mountain Formation, USNM 702a.] 10-13, Ventral, posterior, side, anterior, and dorsal views, XI, and side, dorsal, and anterior views, X2, paratype USNM 148205a. [Cathedral Mountain Formation, USNM 702-low.] 14, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 154900; 25, posteriorly tilted view of the pedicle valve of the preceding specimen, X3, showing dental plates but no deltidial plates; 26, posteriorly tilted brachial valve interior of the preceding specimen, X1.5; 27, 28, interior and posteriorly tilted views of the preceding brachial valve, X6, showing cardinalia and median septum. [Road Canyon Formation, USNM 721o.] 15-19, Ventral, posterior, side, anterior, and dorsal views, XI, and side, anterior, and dorsal views, X2, paratype USNM 154899. [Road Canyon Formation, USNM 719x.] Cenorhynchia parvula, new species: 29, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 148189f; 30-33, ventral, posterior, side, anterior, and dorsal views, XI, and side, dorsal, and anterior views, X3, holotype USNM 148189g; 34-36, interior view, X2, and interior and posteriorly tilted views, X6, showing hinge plate and crura, paratype USNM 148I89h. [Road Canyon Formation, USNM 703a.] 37, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 154902b; 38-41, ventral, posterior, side, anterior, and dorsal views, XI, and anterior, side, and dorsal views, X2, paratype USNM 154902a. [Road Canyon Formation, USNM 702c] Cenorhynchia nasuta, new species: 42-45, Posterior, anterior, side, ventral, and dorsal views, XI, and dorsal, side, and anterior views, X2, paratype USNM 154903a; 49, 50, interior view of the brachial valve, X1.5, X4.5, showing undivided hinge plate and strong median septum, paratype USNM 154903b. [Cherry Canyon Formation (Getaway Member), AMNH 585.] 46, 47, Ventral, posterior, side, anterior, and dorsal views, XI, paratype USNM 152813a and holotype USNM 152813c; 48, ventral and tilted views of the holotype, X4, with beak removed to show cardinalia; 51, interior of the pedicle valve with a mere trace of deltidial plate, X3, paratype USNM 152813d. [Cherry Canyon Formation (Getaway Member), AMNH 512.] NUMBER 21 2373 PLATE 545.?Cenorhynchia. to to ? ** 4fe ^ to ? *t # P P ? P ^* I " 1 10 .... 3 K 19 21 i aw - 22 17 18 i # ? # * # ^ to m ^ w< 42 A A * 43 2 mL 44 45 47 46 2374 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 546 Cenorhynchia and Bryorhynchus Cenorhynchia saginata, new species: I, 2, Dorsal, anterior, side, posterior, and ventral views, XI, paratypes USNM 148174a, b; 3-5, dorsal, side, and anterior views, X2, of the latter para? type. [Road Canyon Formation, USNM 707c] 6-8, 13, Ventral, posterior, side, anterior, and dorsal views, XI, of paratypes USNM 148212g, h, i, k; 9-12, ventral, posterior, side, anterior, and dorsal views, XI, and anterior, dorsal, and side views, X2, holotype USNM 148212J; 19, ventral view of the interior, X4, showing under? side of crura, paratype USNM 148212m; 20, interior of a brachial valve, X1.5, paratype USNM 148212n; 21-24, posteriorly tilted, interior, anterior, and side views of the preceding brachial valve, X5, showing the divided hinge plate and small, narrow inner hinge plates. [Road Canyon Formation (base), USNM 702c] 14, Dorsal, anterior, side, posterior, and ventral views, XI, paratype USNM 154904. [Road Canyon Formation, USNM 7l9x.] 15-18, Ventral, anterior, side, posterior, and dorsal views, XI, and dorsal, side, and anterior views, X2, paratype USNM 148176. [Road Canyon Formation, USNM 703d.] Bryorhynchus bisulcatum (Shumard): 25, Interior of the pedicle valve, X2, showing the muscle scars, hypotype USNM 154909h. [Bell Canyon Formation (Hegler Member), USNM 731.] Cenorhynchia triangulata, new species: 26-29, Ventral, posterior, side, anterior, and dorsal views, XI, and dorsal, anterior, and side views, X2, paratype USNM 148165a; 30-33, ventral, posterior, side, anterior, and dorsal views, XI, and anterior, dorsal, and side views, X2, holotype USNM 148165b; 34, 35, anterior and interior views of the brachial valve, X1.5, paratype USNM I48165d; 36, 37, interior and laterally tilted views of the preceding specimen, X5, showing the cardinalia and septum; 38, interior of the pedicle valve, X1.5, paratype USNM 148165e; 39, anterolateral view of a specimen showing median septum and crura, X6, paratype USNM 148165L [Word Formation (Willis Ranch Member), USNM 706.] NUMBER 21 2375 PLATE 546.?Cenorhynchia and Bryorhynchus. A to 0 to\ 41 26 28 2376 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 547 Cenorhynchia and Bryorhynchus Cenorhynchia ventricosa, new species: 1-5, Anterior, posterior, side, dorsal, and ventral views, XI, holotype USNM 148762. [Neal Ranch Formation (bed 4), USNM 701d.] Bryorhynchus bisulcatum (Shumard): 6-10, Posterior, anterior, side, ventral, and dorsal views of a complete specimen, XI, hypotype USNM 154905a; 77, 78, anterior view of the cardinalia, X1.5, X5, showing the long slender crura, hypotype USNM 154905c [Bell Canyon Formation (Pinery Member), USNM 725h.] 11, 12, Side, anterior, and dorsal views of two immature specimens, XI, hypotypes USNM 154906b, a; 13-17, posterior, anterior, side, ventral, and dorsal views of a young specimen, XI, hypotype USNM 154906c; 18-22, ventral, dorsal, side, anterior, and posterior views of a young adult, XI, hypotype USNM 154906d; 76, anterior view, X4, showing crura and vestigial septum, hypotype USNM 154906c [Bell Canyon Formation (Pinery Member), AMNH 33.] 23-27, Posterior, anterior, ventral, side, and dorsal views of a full-grown adult, XI, hypotype USNM 154907. [Bell Canyon Formation (Hegler Member), USNM 732a.] 28-32, Ventral, dorsal, side, anterior, and posterior views of a complete specimen, XI, hypo? type USNM 154908a; 33-37, posterior, side, dorsal, anterior, and ventral views of a complete specimen, XI, hypotype USNM 154908b; 38, 39, dorsal and anterior views of a specimen with coral attached, XI, paratype USNM 154908c; 46-50, dorsal, ventral, side, anterior, and posterior views of a large strong costellate specimen, XI, hypotype USNM 154908d; 63, 64, interior and posteriorly tilted views of the pedicle valve, XI.5, hypotype USNM 154908f; 70, 71, interior views of another pedicle valve, XI, hypotype USNM 154908g; 72-75, laterally tilted and interior views, XI, and the same views, X2, of the brachial valve, showing the long crura, hypotype USNM 1549081. [Bell Canyon Formation (Rader Member), USNM 725f.] 40, Side view of a complete specimen with attached corals, XI, hypotype USNM 154909a; 41-45, anterior, posterior, side, ventral, and dorsal views of a small adult, XI, hypotype USNM 154909b; 51-55, ventral, side, dorsal, posterior, and anterior views of a specimen with few costae, XI, hypotype USNM 154909c; 56-60, ventral, dorsal, side, anterior, and posterior views of an anteriorly costate specimen, XI, hypotype USNM 154909d; 65-69, posteriorly tilted, interior, and laterally tilted views, X2, and posteriorly tilted and interior views of a pedicle valve, XI, showing the muscles and pallial marks, hypotype USNM 154909i; 79, interior of an obese pedicle valve, X2, showing muscles and part of the pallial marks, hypotype USNM I54909J. [Bell Canyon Formation (Hegler Member), USNM 731.] 61, Dorsal view of a large complete specimen, XI, hypotype USNM 154910a; 62, posterior of the preceding specimen, X5, showing foramen and conjunct deltidial plates. [Bell Canyon Formation (Pinery Member), USNM 725n.] NUMBER 21 2377 PLATE 547.?Cenorhynchia and Bryorhynchus. 2378 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 548 Bryorhynchus, Leiorhynchoidea, and Madarosia Bryorhynchus gratiosum (Girty): 1-5, Posterior, anterior, side, ventral, and dorsal views, XI, holotype USNM 118559. [Bell Canyon Formation (probably Hegler Member), USGS 2930.] Bryorhynchus bisulcatum (Shumard): 6-8, Laterally tilted, posteriorly tilted, and interior views, X3, showing threadlike median ridge, crura, and socket ridges, hypotype USNM 154909o; 10-12, interior, posteriorly tilted, and interior views of another brachial valve, X3, showing cardinalia, hypotype USNM 154909m; 17, interior of the pedicle valve, X2, showing pallial marks, hypotype USNM 154909k. [Bell Canyon Formation (Hegler Member), USNM 731.] 9, Anterior view of the interior, X3, showing crura and median ridge, hypotype USNM 154910b. [Bell Canyon Formation (Pinery Member), USNM 725n.] 13-16, Interior and laterally tilted views, X1.5, and the same views, X4, showing crura and socket ridges, hypotype USNM 154908J. [Bell Canyon Formation (Rader Member), USNM 725f.] Madarosia pentagona, new species: 18, Dorsal, side, anterior, and ventral views of a complete specimen, XI, holotype USNM 154930 (for interior views see Plate 513: figures 39-41.) [Cherry Canyon Formation (Getaway Member), AMNH 512.] Leiorhynchoidea amygdaloidea, new species: 19-23, Posterior, anterior, side, ventral, and dorsal views, XI, holotype YPM 12552. [Word Formation (Willis Ranch Member), R. E. King 144.] 24, 25, Interior and exterior of a large pedicle valve, XI, paratype USNM 148268a; 26, 27, preceding specimen posteriorly tilted to show dental plates, XI, X2; 28, posterior of the pre? ceding specimen, X2, showing disjunct deltidial plates. [Word Formation (lens between Willis Ranch and Appel Ranch members), USNM 706b.] 29-33, Posterior, anterior, side, ventral, and dorsal views of a young adult, XI, paratype USNM 148282. [Word Formation (China Tank Member), USNM 721p.] 34, 35, Anterior views of the interior, X3, showing the crura and median septum, paratype USNM 148265; 36-38, interior view, XI, and laterally tilted and interior views, X4, of a brachial valve, showing crura and median septum, paratype USNM 148263a. [Word Formation (Willis Ranch Member), USNM 706.] NUMBER 21 2379 PLATE 548.?Bryorhynchus, Leiorhynchoidea, and Madarosia. 2380 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 549 Leiorhynchoidea Leiorhynchoidea scelesta, new species: 1, 2, 15, Dorsal, ventral, and side views of a young adult, XI, paratype USNM 148276c [Word Formation (Appel Ranch Member), USNM 715i.] 3-6, Anterior, laterally tilted, interior, and posteriorly tilted views, X3, showing the crura and median septum, paratype USNM 152882f; 7, interior of the pedicle valve, XI, showing the muscle scars and small deltidial plates, paratype USNM 152882t; 8, anterior view of a fragmentary brachial valve, XI, paratype USNM 152882-1; 9, side view of a broken specimen, X2, showing the median septum and crura, paratype USNM 152882w; 10, interior of a large brachial valve, X2, showing a nearly fused hinge plate, paratype USNM 152882h; 11, anterior view of a young specimen, X3, showing the crura and median septum, paratype USNM 152882k; 12-14, dorsal, ventral, and posterior views of a young adult, XI, paratype USNM 152882b; 16-19, ventral, side, dorsal, and anterior views of a nearly full-grown adult, XI, paratype 152882c; 20-24, ventral, anterior, side, dorsal, and posterior views of an adult, XI, holotype USNM 152882d; 25-28, side, dorsal, anterior, and ventral views of a large adult, XI, paratype USNM 152882c [Word Formation (Appel Ranch Member), USNM 719z.] NUMBER 21 2381 PLATE 549.?Leiorhynchoidea. t \ >> -'J 4 f" , 2382 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 550 Leiorhynchoidea and Bryorhynchus Leiorhynchoidea sulcata, new species: 1, 2, Dorsal and ventral views of a young individual, XI, paratype USNM 154619b. [Cherry Canyon Formation (South Wells Member), AMNH 414.] 3-7, Dorsal, anterior, ventral, side, and posterior views of a round specimen, XI, paratype USNM 155056a. [Cherry Canyon Formation (South Wells Member), USGS 7649.] Bryorhynchus plicatum, new species: 8-12, posterior, anterior, side, dorsal, and ventral views, XI, holotype USNM 153484a; 13, 14, posterior and dorsal views of an interior mold, XI, showing the median septum, paratype USNM 153484b; 15-19, posterior, anterior, side, ventral, and dorsal views of a slightly crushed paratype, XI, USNM 153484d. [Word Formation (Appel Ranch Member), USNM 731z.] Leiorhynchoidea rotundidorsa, new species: 20, 21, Ventral and dorsal views of an immature specimen, XI, paratype USNM I48285f; 22, interior of the preceding specimen, X4, showing cardinalia (specimen unfortunately now broken in two pieces); 23, interior of a pedicle valve tilted to show the short dental plates, XI, partype USNM 148285d; 24-27, side, anterior, exterior, and interior views of another pedicle valve, XI, paratype USNM 148285c; 28-31, interior and exterior views, XI, and posterior and interior views, X2, showing cardinalia, paratype USNM 148285a; 32-35, exterior, interior, anterior, and side views of a brachial valve, XI, holotype USNM 148285b; 36, 37, posterior and interior views of the preceding specimen, X2, showing the cardinalia. [Cherry Canyon Formation (Getaway Member), USNM 728.] Leiorhynchoidea scelesta, new species: 38, Ventral, posterior, side, anterior, and dorsal views of an immature individual, XI, paratype USNM 154911a; 39-43, posterior, anterior, side, dorsal, and ventral views of a young specimen, XI, paratype USNM 154911b; 44-46, ventral, side and dorsal views, XI, of a young adult, paratype USNM 148276a. [Word Formation (Appel Ranch Member), USNM 715i.] 47, 48, Ventral and dorsal views of another young individual, XI, paratype USNM 152882a; 49, 50, anterior view of the interior, X1.5, XI, showing the anteriorly expanding crura and their relation to the median seputm, paratype USNM 152882g; 51-53, ventral, posterior, side, anterior, and dorsal views of three immature individuals, XI, paratypes USNM 152882o, p, q. [Word Formation (Appel Ranch Member), USNM 7l9z.] NUMBER 21 2383 PLATE 550.?Leiorhynchoidea and Bryorhynchus. 2384 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 551 Paranorella, Petasmatherus, and Anteridocus Paranorella imperialis Cloud: 1-5, Posterior, anterior, side, dorsal, and ventral views of a com? plete specimen, XI, hypotype USNM 148295a. [Permian (middle of the Waagenoceras Shale), 1 km south of Malascachas, Coahuila, Mexico.] Paranorella aquilonia, new species: 6-10, Ventral, dorsal, posterior, side, and anterior views, XI, holotype USNM 148296. [Cherry Canyon Formation (Getaway Member), AMNH 600.] 11, 12, Interior of the brachial valve, XI, X2, showing the small cardinalia, paratype USNM 148298. [Bell Canyon Formation (Lamar Member), AMNH 347.] Paranorella comptula, new species: 13, 14, Ventral and dorsal views of a crushed individual, XI, holotype USNM 148293; 15, interior of an imperfect pedicle valve, XI, paratype USNM 148292a; 16, 17, posteriorly tilted and interior views of an imperfect brachial valve, XI, showing the cardinalia, paratype USNM 148292b; 18, interior of a brachial valve, X4, showing an incomplete hinge plate, paratype USNM 148292c [Word Formation (China Tank Member), USNM 706c] Paranorella species 1: 19-22, Exterior, interior, side, and anterior views of a pedicle valve, XI, figured specimen USNM 148290a; 23, 24, exterior and interior of another pedicle valve, XI, figured specimen USNM 148290b; 25, interior of a pedicle valve, X1.5, showing muscle scars and trace of pallial marks, figured specimen USNM 148290c; 27, 28, interior of the brachial valve, XI, X3, showing the cardinalia, figured specimen USNM 154912a; 29, interior of another fragment of a brachial valve, X2, figured specimen USNM 154912b; 30, interior of a pedicle valve, XI, showing the muscle field, figured specimen USNM 154912c [Word Formation (lens between Willis Ranch and Appel Ranch members), USNM 706b.] 26, Interior of a pedicle valve, XI, figured specimen USNM 148297. [Word Formation (Willis Ranch Member), USNM 706c] Paranorella species 2: 31, Interior of a brachial valve fragment, XI, showing cardinalia, figured specimen USNM 152874a; 32, 33, interior of another fragmentary brachial valve, XI, X2, showing crura and median septum, figured specimen USNM 152874d; 34, interior of a pedicle valve, XI, showing muscle scars, figured specimen USNM 152874c. [Bone Spring Formation, USNM 728f.] 47, Impression of the interior of the brachial valve, XI, figured specimen USNM 152875. [Skinner Ranch Formation (Poplar Tank Member), USNM 729f.] Petasmatherus pusillus (Girty): 35, Dorsal, anterior and side views, XI, holotype USNM 118571; 36-39, ventral, anterior, side, and dorsal views, X3, of the holotype; 40-42, anterior, dorsal, and side views, X4, of the holotype. [Bell Canyon Formation (Pinery Member), USGS 2930.] Anteridocus subcarinalus, new species: 43-46, Posterior, anterior, side, ventral, and dorsal views, XI, and anterior, side, and dorsal views, X2, holotype USNM 152980. [Bell Canyon For? mation (Pinery Member), USNM 725n.] NUMBER 21 2385 PLATE 551.?Paranorella, Petasmatherus, and Anteridocus. 2386 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 552 Aphaurosia, Divaricosta, Cenorhynchia, Pontisia, Ptilotorhynchus, Phrenophoria, Deltarina, Antronaria, Fascicosta, and Madarosia Aphaurosia scutata, new species: 1, Dorsal view of a complete specimen, XI, paratype USNM 154913; 2-5, anterior, side, dorsal and ventral views of the preceding specimen, X2. [Bell Can? yon Formation (Lamar Member), USNM 728p.] Divaricosta squarrosa, new species: 6, Exterior of a pedicle valve, X2, showing intercalated and bifurcated costae, hypotype USNM 154675a; 7-9, anterior, dorsal, and side views of a com? plete specimen X2, showing the overlapping lamellae at the anterior, paratype AMNH 27904/2; 10, posterior of the pedicle valve, X5, showing the conjunct deltidial plates, hypotype USNM 154675b. [Cherry Canyon Formation . (Getaway Member), AMNH 512 = USNM 728.] Cenorhynchia fracida, new species: 11-13, Dorsal, side, and anterior views of a complete specimen, X3, paratype USNM 154721. [Word Formation (Willis Ranch Member), USNM 706c] Pontisia stehlii stehlii Cooper and Grant: 14, Ventral view of interior and the beak of same specimen, X3, showing the undivided hinge plate and the conjunct deltidial plates, paratype USNM 154745J. [Cathedral Mountain Formation, USNM 726o.] Ptilotorhynchus delicatum, new species: 15, Interior of the brachial valve, X4, showing divided hinge plate and thick median ridge, paratype USNM 154712b; 16, dorsal view of an immature specimen, X4, showing the reflected lip on the deltidial plates, paratype USNM 154712a. [Bell Canyon Formation (Lamar Member), USNM 728p.] Phrenophoria vetula, new species: 17, Interior of the pedicle valve, tilted to show the dental plates, X2, paratype USNM 154914. [Cathedral Mountain Formation, USNM 721u.] Deltarina magnicostata, new species: 18-21, Dorsal, anterior, and side views, XI, and dorsal view, X2, of a complete, wide specimen, paratype USNM 154915. [Bell Canyon Formation (Lamar Member), USNM 728p.] Antronaria mesicostalis (Girty): 22-26, Ventral, anterior, posterior, side, and dorsal views of a complete specimen, XI, hypotype USNM 154511; 27-29, side, dorsal, and anterior views of the preceding specimen X2. [Cibolo Formation (Breccia Zone of Udden), USNM 738s.] Fascicosta bella, new species: 30-34, Dorsal, anterior, side, posterior, and ventral views, X3, paratype USNM 154513a; 35, 36, posteriorly tilted and interior views, of the pedicle valve, X2, showing dental plates and absence of deltidial plates, paratype USNM 154513b; 37, ventral view of the interior, X6, showing long crura and low median ridge, paratype USNM 154513c [Bell Canyon Formation (Rader Member), USNM 725f.] Madarosia anterolamellala, new species: 38-41, Anterior, ventral, dorsal, and side views, XI, of a young adult, paratype USNM 154916a; 42-47, posterior, side, dorsal, anterior, and ventral views, XI, and anterior view of another young individual, X2, paratype USNM 154916b; 48-53, dorsal, posterior, anterior, ventral, and side views, XI, and anterior view, X2, showing the anterior lamellae, paratype USNM 154916c; 54, anterior of another specimen in which the anterior lamellae have not yet developed, X2, paratype USNM 154916d; 55, interior of the brachial valve, X4, showing the small cardinalia and short hinge plate, paratype USNM 154916c; 56, interior of another fragmentary brachial valve, X3, paratype USNM 15491fif; 57, side view of a broken specimen, X3, showing median septum and long, slender crura, para? type USNM I54916g; 58, interior of the pedicle valve tilted to show the small dental plates and lack of deltidial plates, X3, paratype USNM 154916h. [Bell Canyon Formation (Rader Member), USNM 740j.] NUMBER 21 2387 PLATE 552.?Aphaurosia, Divaricosta, Cenorhynchia, Pontisia, Ptilotorhynchus, Phrenophoria, Deltarina, Antronaria, Fascicosta, and Madarosia. 2388 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 553 Tautosia, Stenoscisma, Wellerella, and Phrenophoria Tautosia shumardiana (Girty) [hypotypes]: 1-3, Dorsal, side, and anterior views, XI, small adult shell USNM 154920a; 4-6, dorsal, side, and anterior views, XI, small adult shell USNM 154920b; 7-9, dorsal, side, and anterior views, XI, adult shell USNM 154920c [Bell Canyon Formation (Lamar Limestone Member), USNM 728p.] Stenoscisma abbreviatum, new species: 10-14, Dorsal, ventral, side, posterior, and anterior views, XI, adult paratype USNM 154918b; 15-20, dorsal views, XI, X2, ventral, side, posterior, and anterior views, XI, adult holotype USNM 154918a; 21, interior view of pedicle valve with attached beak end of brachial valve with camarophorium, X2, paratype USNM 154918c; 22, anterior view into interior of broken shell with spondylium and camarophorium, X2, paratype USNM 154918d; 23, side oblique view of fragment of brachial valve with broad stolidium, XI, para? type USNM 154918e; 27, interior view of pedicle valve with foramen and spondylium, X2, paratype USNM 154918f. [Bell Canyon Formation (Lamar Limestone Member), USNM 728p.] 24?26, Dorsal views, X1.5, XI, ventral view, XI, small adult shell with stolidium, paratype USNM 154917a. [Bell Canyon Formation (Lamar Limestone Member), AMNH 347 (= L-2).] Stenoscisma multicostum Stehli: 28-32, Dorsal, ventral, side, anterior, and posterior views, XI, adult shell, hypotype USNM 154919a. [Cibolo Formation, USNM 738h.] Wellerella girtyi girtyi, new subspecies: 33, Anterolateral view, X3, showing the crura and undi? vided hinge plate, paratype USNM 154732n; 34, interior of the brachial valve, X3, showing hinge plate and crura, paratype USNM 154732m. [Word Formation (Willis Ranch Member), USNM 706c] Phrenophoria subcarinata Cooper and Grant: 35, Side view of a brachial valve, XI, hypotype USNM 148385g; 36, the same view, X3, showing boring; 37, enlargement of boring and shell margin, X6; 38, 39, two views, X6, showing the protective tube surrounding the boring. [Word Formation (lens between the Willis Ranch and Appel Ranch members), USNM 706b.] Tautosia elegans (Girty): 40, Interior of the brachial valve, X3, showing the hinge plate, hypotype USNM 154921. [Bell Canyon Formation (Lamar Member), USNM 738.] Tautosia transenna, new species: 41, Dorsal view of the interior, showing the underside of the hinge plate and crura, X3, paratype USNM 154809c [Word Formation (Willis Ranch Mem? ber), USNM 706c] 42-44, Interior, posteriorly tilted, and laterally tilted views of the brachial valve, X4.5, show? ing the fused hinge plate and long crura, paratype USNM 154807c [Cherry Canyon Formation (Getaway Member), USNM 728.] NUMBER 21 2389 PLATE 553.?Tautosia, Stenoscisma, Wellerella, and Phrenophoria. 2390 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 554 Stenoscisma Stenoscisma amoenum, new species: 1-7, Dorsal, ventral, side, posterior, and anterior views of holotype, X2 (figures 2, 4, XI), USNM 152271a; 8-14, Dorsal, ventral, side, posterior, and anterior views, X2 (figures 9, 11, XI), paratype USNM 152271b. [Skinner Ranch Formation (Decie Ranch Member), USNM 708q.] Stenoscisma repigratum, new species: 15-22, Dorsal view, X2, (figures 15, 22, XI), holotype USNM 152281 (figure 21 shows interior with camarophorium and crus above edge of spon? dylium). [Word Formation (China Tank Member), USNM 706c] Stenoscisma aberrans, new species: 23, 24, Ventral views, XI, X2, showing spondylium and end of camarophorium, holotype USNM 152876a; 25-31, Dorsal, side, posterior, and anterior views of same specimen, X2 (figures 25, 28, 30, XI); 32, Ventral valve interior, XI, paratype USNM 152876b. [Bell Canyon Formation (Rader Member), USNM 725f.] NUMBER 21 2391 PLATE 554.?Stenoscisma. 2392 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 555 Stenoscisma Stenoscisma aptatum, new species: 1^4, Dorsal views of two nepionic shells, XI, X2, paratypes USNM 152241a, b; 5-9, dorsal, ventral, and side views, X2, and dorsal and side views, XI , of nepionic shell, paratype USNM 152241c; 10-14, dorsal, ventral, and side views of nepionic shell, XI, X2, paratype USNM 152241d; 15-20, dorsal, ventral, side, and anterior views of juvenile with incipient costae, XI, X2, paratype USNM 152241e; 21-26, dorsal, ventral, side, anterior, and posterior views, XI and X2, juvenile paratype USNM 15224H; 27-33, dorsal, ventral, side, posterior, and anterior views of large, costate juvenile, XI , X2, paratype USNM 152241 g. [Base of Road Canyon Formation, USNM 702c] 34-40, Dorsal, ventral, side, posterior, and anterior views, XI, X2, subadult paratype USNM 152239. [Basal Cathedral Mountain Formation, USNM 702.] 41-47, Dorsal, ventral, posterior, anterior, and side views of adult with stolidium, XI , X2, holotype USNM 152240. [Base of Road Canyon Formation, USNM 702c] 48-50, Dorsal view, XI, X2, and anterior X2, of adult shell showing traces of successive stolidia, paratype USNM 152244. [Cathedral Mountain Formation (Institella Zone), USNM 703bs.] NUMBER 21 2393 PLATE 555.?Stenoscisma. 5 22 7 9 *? 10 ' 'I 24 2 3 9 4 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 556 Stenoscisma Stenoscisma bonum, new species: 1-4, Dorsal, ventral, and side views, X2 (figure 2, XI) juve? nile paratype USNM 152877j; 5-8, dorsal, ventral, and side views, X2 (figure 6, XI), juvenile paratype USNM 152877k; 9-12, dorsal, ventral, and side views, X2 (figure 10, XI), juvenile paratype USNM 152877m; 13-16, dorsal, ventral, and side views, X2 (figure 14, XI), juvenile paratype USNM 152877n; 17 dorsal interior, X3, showing camarophorium, paratype USNM 152877o; 18, interior of broken shell, X3, showing camarophorium and crus, paratype USNM 152877p; 19, dorsal interior of small adult, X3, paratype USNM 152877q; 20, ventral interior X3, showing spondylium, paratype USNM 152877r; 21-27, dorsal, ventral, side, anterior, and posterior views of adult with stolidium, XI, X2, holotype USNM 152877s. [Road Canyon Formation USNM 724j.] 28-33, Dorsal, ventral, side, and posterior views of adult with stolidium, XI, X2, paratype USNM 154575a. [Road Canyon Formation, USNM 724b.] Stenoscisma bellatulum, new species: 34-38, Dorsal, ventral, and side views XI, X2, juvenile or small adult paratype USNM 154574a; 39, ventral interior, X2, paratype USNM 154574b; 40, dorsal interior, X2, paratype USNM 154574c; 41?47, dorsal, ventral, side, posterior, and ante? rior views, XI, X2, paratype USNM 154574d; 48-54, dorsal, ventral, side, anterior, and pos? terior views, XI, X2, holotype USNM 154574c [Neal Ranch Formation (bed 4), USNM 727c] NUMBER 21 2395 PLATE 556.?Stenoscisma. , w 35 w 37 y . . * ?? 34 36 38 39 i - 40 M k\ 47 iA t w a y > ' . 2396 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 557 Stenoscisma Stenoscisma calvatum, new species: 1-7, Dorsal, ventral, side, posterior, and anterior views, X2, and dorsal and side views, XI, nepionic paratype USNM 152340h; 8-14, dorsal, ventral, side, posterior, and anterior views, XI, X2, nepionic paratype USNM 152340i; 22, ventral interior, X2, paratype USNM 152340o; 23, ventral interior X2, showing pallial lines, paratype USNM 152340p; 32, dorsal interior, X2, showing hinge plate, cardinal process, and camarophorium, paratype USNM 152340q; 33-39, dorsal, ventral, side, posterior, and anterior views, XI, X2, paratype USNM 152340J; 40^16, dorsal, ventral, side, posterior, and anterior views, XI, X2, paratype USNM 152340k; 47-53, dorsal, ventral, side, posterior, and anterior views, XI, X2, paratype USNM 152340m; 54-60, dorsal, ventral, side, posterior, and anterior views, XI, X2, holotype USNM 152340n. [Road Canyon Formation, USNM 7211.] 15-21, Dorsal, ventral, side, posterior, and anterior views, XI, X2, paratype USNM 152341f; 24-30, dorsal, ventral, side, posterior, and anterior views, XI, X2, paratype USNM 15234lg; 31, side interior view, X2, showing camarophorium and spondylium, paratype USNM 152341h. [Road Canyon Formation, USNM 721 x.] Stenoscisma inaequale (Girty): 61-67, Dorsal, ventral, side, posterior, and anterior views, XI, X2, holotype USNM 155138. [Bone Spring Formation, North Apache Canyon, Sierra Diablo, Texas, USGS 4643.] NUMBER 21 2397 PLATE 557.?Stenoscisma. 10 11 * 21 I &* 30 37 J 44 k. 51 A 53 j ;iin, S M n r.k 2398 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 558 Stenoscisma Stenoscisma camurum, new species: 1-6, Dorsal, ventral, side, and anterior views, XI, X2, nepionic paratype USNM 154573a; 7-12, dorsal, ventral, side, and anterior views, XI, X2, juvenile paratype USNM 154573b; 13-18, dorsal, side, posterior, and anterior views, XI, X2, juvenile paratype USNM 154573c; 19-25, dorsal, ventral, posterior, side, and anterior views, XI, X2, juvenile paratype USNM 154573d; 39, anterior view of dorsal valve with two stolidia, X1.4, paratype USNM 154573e; 42, lateral view of broken shell, X1.4, showing interior with spondylium, crus, and camarophorium, paratype USNM 154573L [Cherry Canyon Formation (Getaway Member), AMNH 585.] 26-29, Dorsal, side, and ventral views of paratype with large right stolidium, XI, X1.4, USNM 152237a; 30-34, dorsal, ventral, anterior, and side views, XI, XI.4, adult paratype USNM 152237b; 35-38, dorsal, ventral, and anterior views of adult with broad stolidium, XI , X1.5, holotype USNM 152878; 40, ventral interior, X1.4, paratype USNM 152237c; 41, dorsal interior, X2, paratype USNM 152237d. [Road Canyon Formation, USNM 707c] NUMBER 21 2399 PLATE 558.?Stenoscisma. ^ww 2400 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 559 Stenoscisma Stenoscisma doricranum, new species: 1-6, Dorsal, ventral, side, posterior, and anterior views, X2 (figure 2, XI), nepionic paratype USNM 152286a; 7-12, dorsal, ventral, side, posterior, and anterior views, X2 (figure 8, XI), nepionic paratype USNM 152286b; 13-18, dorsal, ventral, side, anterior, and posterior views, X2, juvenile paratype USNM 152286c; 19-24, dorsal, ven? tral, side, anterior, and posterior views, X2 (figure 20, XI), juvenile paratype USNM 152286d; 25-30, dorsal, ventral, side, anterior, and posterior views, X2 (figure 26, XI), juvenile paratype USNM 152286e; 34-39, dorsal, ventral, side, inverted posterior, and anterior views, X2 (figure 35, XI), adult paratype USNM 152286f; 40^45, dorsal, ventral, side, inverted posterior, and anterior views, X2 (figure 41, XI), adult paratype USNM 152286g; 46-51, dorsal, ventral, side, inverted posterior, and anterior views," X2 (figure 47, XI), adult holotype USNM 152286h; 52, dorsal interior, X2, showing hinge plate, sockets, cardinal process, and camarophorium, para? type USNM 152286i; 53, articulated posterior part of shell, X2, showing spondylium and camarophorium; paratype USNM 152286J; 54, articulated beak region, X2, showing relationship of cardinal process to spondylium, paratype USNM 152286k. [Cathedral Mountain Formation (lower part), USNM 702a.] 31-33, Dorsal, ventral, and side views, XI, adult paratype USNM 152285. [Cathedral Moun? tain Formation (near base), USNM 702.] 55, Side interior view of specimen that formed base for growth of bryozoan colony, in living position, X1.5, paratype USNM 152291a. [Cathedral Mountain Formation (near base), USNM 702un.] NUMBER 21 2401 PLATE 559.?Stenoscisma. 0 2402 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 560 Stenoscisma Stenoscisma exutum, new species: 1-7, Dorsal, ventral, side, posterior, and anterior views, XI, X2, juvenile paratype USNM 152296c; 8, anterolateral view, XI, showing multiple stolidia, paratype USNM 152296g; 9, ventral interior, XI, showing spondylium, paratype USNM 152296h; 11-17, dorsal, ventral, side, posterior, and anterior views, XI, X2, juvenile paratype USNM 152296i; 18-24, dorsal, ventral, side, anterior, and posterior views, XI, X2, small adult para? type USNM 152296J; 25-31, dorsal, ventral, side, anterior, and posterior views, XI, X2, adult holotype USNM 152296c [Cathedral Mountain Formation (near base), USNM 702.] 10, Dorsal interior, XI, showing cardinalia and camarophorium with intercamarophorial plate, paratype USNM 152301a; 32-38, dorsal, ventral, side, posterior, and anterior views, XI, X2, adult paratype USNM 152301b. [Cathedral Mountain Formation (near base), USNM 703b.] NUMBER 21 2403 PLATE 560.?Stenoscisma. 2 4 0 4 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 561 Stenoscisma Stenoscisma fabarium, new species: 1, Ventral interior, X2, nepionic paratype USNM 152234a; 2, ventral interior, X2, nepionic paratype USNM 152234b; 3-8, dorsal, ventral side, and ante? rior views, XI, X2, nepionic paratype USNM 152234c; 9-14, dorsal, ventral, side, and anterior views, XI, X2, juvenile paratype USNM 152234d; 15, ventral interior, X2, juvenile paratype USNM 152234e; 16, dorsal interior, X2, juvenile paratype USNM 152234f; 17-23, dorsal, ven? tral, side, anterior, and posterior views, XI, X2, juvenile paratype USNM 152234g; 24-30, dorsal, ventral, side, anterior, and posterior views, XI, and X2, juvenile paratype USNM 152234h; 34-40, dorsal, ventral, side, anterior, and posterior views, XI, X2, young adult paratype USNM 1522341; 41, ventral interior, X2, showing pallial lines, young adult paratype USNM 152234j; 42-48, dorsal, ventral, side, anterior, and posterior views, XI, X2, adult paratype USNM 152234k; 49-55, dorsal, ventral, side, anterior, and posterior views, XI, X2, adult holotype USNM 152234-1; 56, anterolateral view, X2, showing stolidium, adult paratype USNM 152234m; 57-63, dorsal, ventral, posterior, anterior, and side views, XI, X2, adult paratype USNM 152234n; 64, side view with dorsal valve broken to show profiles of camarophorium and crura, X2, paratype USNM 152234o; 65-66, stereo pair of dorsal interior, X2, showing cardinalia and camarophorium, paratype USNM 152234p; 67, dorsal interior, X2, paratype USNM 152234q. [Cathedral Mountain Formation (near base), USNM 708u.] 31-33, Dorsal and side views, XI, X2, young adult paratype USNM 152233. [Cathedral Mountain Formation (base), USNM 702-low.] NUMBER 21 2405 PLATE 561.?Stenoscisma. 2 4 0 6 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 562 Stenoscisma Stenoscisma hadrum, new species: 1-4, Dorsal, ventral, side, and anterior views, XI, nepionic paratype USNM 154576a. [Skinner Ranch Formation, USNM 726h.] 5-9, Dorsal, ventral, side, anterior, and posterior views, XI, juvenile paratype USNM 152272; 10-12, dorsal, ventral, and side views, XI, young adult paratype USNM 152274a; 13-15, dorsal, ventral, and side views, XI, young adult paratype USNM 152274b; 25-28, dorsal, ven? tral, side, and anterior views, XI, adult paratype USNM 152274d; 30-34, dorsal, ventral, side, anterior, and posterior views, XI, adult holotype USNM 152274c [Skinner Ranch Formation (near top), USNM 710r.] 16-19, Dorsal, ventral, side, and anterior views, XI (figure. 19: X1.5), adult paratype USNM 154577a. [Hess Formation, USNM 726n.] 20-24, Dorsal, ventral, side, anterior, and posterior views, XI, Xl.5, small adult paratype with stolidium, USNM 152267a; 29, dorsal interior, XI, paratype USNM 152267c; 35-36, dorsal interior, straight, and oblique views, XI, showing camarophorium and pallial lines on stoli? dium, paratype USNM 152267c (opposite valve of figure 29); 37-39, dorsal, side, and anterior views, XI, Xl.5, adult paratype USNM 152267b. [Hess Formation (Taylor Ranch Member), USNM 702c] 40, Fragment of dorsal exterior, XI, showing broad stolidium, paratype USNM 152275. [Skinner Ranch Formation (Decie Ranch Member), USNM 715a.] NUMBER 21 2407 PLATE 562.?Stenoscisma. 2 4 0 8 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 563 Stenoscisma Stenoscisma hueconianum (Girty): 1-7, Dorsal, ventral, side, posterior, and anterior views, XI, X2, juvenile hypotype USNM 152247a; 8-14, dorsal, ventral, side, posterior, and anterior views, XI, X2, juvenile hypotype USNM 152247b; 15-21, dorsal, ventral, side, posterior, and anterior views, XI, X2, young adult hypotype USNM 152247c; 22-28, dorsal, ventral, side, posterior, and anterior views, XI, X2, adult hypotype USNM 152247d. [Alacran Mountain Formation, USNM 712c] 29, Interior view of pedicle valve, X2, hypotype USNM 154578a; 30-32, interior views of brachial valve, X2, hypotypes USNM 154578b-d; 33, oblique interior view of broken shell, X2, hypotype USNM 154578e; 34-40, dorsal, ventral, side, posterior, and anterior views, XI , X2, adult holotype USNM 155137; 41-47, dorsal, ventral, side, posterior, and anterior views of adult shell, XI, X2, hypotype USNM 154578f; 48-54, dorsal, ventral, side, anterior, and posterior views of adult shell with stolidium, XI, X2, hypotype USNM 154578g. [Alacran Mountain Formation, USNM 741 h.] NUMBER 21 2409 PLATE 563.?Stenoscisma. 2410 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 564 Stenoscisma Stenoscis?na levicostum, new species: 1-5, Dorsal views, X2, XI, ventral, side, and anterior views, X2, nepionic paratype USNM 1528791; 6-10, dorsal views, X2, XI, ventral, side, and anterior views, X2, juvenile paratype USNM 152879a; 11-17, dorsal, ventral, side, anterior, and posterior views, XI, X2, juvenile paratype USNM 152879j; 18-24, dorsal, ventral, side, posterior, and anterior views, XI, X2, young adult paratype USNM 152879k; 40, side view of adult with stolidium, XI, paratype USNM 152879m; 41, interior view of pedicle valve, XI, paratype USNM 152879-1. [Bone Spring Formation (lower), USNM 728g.] 25-31, Dorsal, ventral, side, anterior, and posterior views, XI, X2, adult paratype USNM 154579a; 32-38, dorsal, side, ventral, anterior, and posterior views, XI, X2, adult holotype USNM 154579b; 39, side oblique view of broken shell, X2, showing spondylium, camaropho? rium, and crus, paratype USNM 154579c [Bone Spring Formation (lower) AMNH 591.] NUMBER 21 2411 PLATE 564.?Stenoscisma. 2412 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 565 Stenoscisma Stenoscisma "deloi" (R. E. King): 1-5, Dorsal, ventral, side, posterior, and anterior views, XI, specimen illustrated as Camarophoria deloi by King (1931, pi. 34: fig. 26), YPM 12694a; 6-10, dorsal, ventral, side, posterior, and anterior views, XI, additional specimen from same locality but not illustrated by King, YPM 12694b. [Sawmill Canyon, Santa Rita Mountains, near onyx mine, 40 miles south of Tucson, Arizona.] 11-15, Dorsal, ventral, side, posterior, and anterior views, XI, specimen illustrated as Camarophoria deloi by King 1931 (pi. 34: figs. 25a-c), YPM 12693 (now considered S. manicu? lum, new species, q.v.). [Road Canyon Formation (First Limestone Member of Word Forma? tion, of P. B. King, 1931 = Road Canyon Formation), R. E. King 241.] Stenoscisma maniculum, new species: 16-22, Dorsal, ventral, side, anterior, and posteroir views, XI, X2, holotype USNM 152305a; 23, interior of articulated shell, broken to show spondylium and camarophorium, X2, paratype USNM 152305b. [Road Canyon Formation, USNM 706f.] Stenoscisma kalum Stehli [all hypotypes]: 24-26, Ventral views, XI, X2, and side view, X2, of ventral valve, USNM 142519b; 27, dorsal interior, XI, also illustrated by Grant (1965, pi. 19: fig. 4), USNM 142520a; 28, interior of ventral valve with median stolidium, XI, also illus? trated by Grant (1965, pi. 19: fig. 4), USNM 142519a; 29-30, ventral interior, X2, XI, showing teeth and spondylium, USNM 142519c; 31, dorsal exterior, X2, USNM 142520b; 32, interior of broad ventral valve, X2, USNM 142519d. [Bone Spring Formation, USNM 728f.] Stenoscisma multicoslum Stehli [all hypotypes]: 33-39, Dorsal, ventral, anterior, side, and pos? terior views of large adult, XI, and Xl.5, USNM 152880. [Cibolo Formation, USNM 728m.] 40-41, Ventral and side views of ventral valve XI, also illustrated by Grant (1965, pi. 19: fig. 3) USNM 142515a; 42-43, dorsal and side views of dorsal valve, XI, also illustrated by Grant (1965, pi. 19: fig. 3a) USNM 142518a; 44, interior view of asymmetrical dorsal valve with camarophorium, stolidium, Xl.5, USNM 142518b; 45, interior view broken ventral valve with spondylium, transverse gonocoel grooves, Xl.5, USNM 142515b. [Bone Spring Formation, USNM 728f (= AMNH 629).] NUMBER 21 2413 PLATE 565.?Stenoscisma. i W ?A A ip(2 m 10 m 2414 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 566 Stenoscisma Stenoscisma myioides, new species: 1-7, Dorsal, ventral, side, posterior, and anterior views, Xl.5, X3, nepionic paratype USNM 154580a; 8-14, dorsal, ventral, side, posterior, and anterior views, Xl.5, X3, nepionic paratype USNM 154580b; 15-21, dorsal, ventral, side, posterior, and anterior views, Xl.5, X4.5, juvenile paratype USNM 154580c; 25-31, dorsal, ventral, side, anterior, and posterior views, XI.5, X4.5, young adult paratype USNM 154580d; 32-37, dorsal, ventral, side, and posterior views, Xl.5, X4.5, young adult paratype USNM 154580c [Skinner Ranch Formation, USNM 7l6q.] 22, Ventral interior, X3, paratype USNM 152217a; 23-24, dorsal-interior side and straight views, X3, showing camarophorium, cardinalia, and pallial lines, paratype USNM 152217b; 38-44, dorsal, ventral, side, anterior, and posterior views, XI, X3, adult paratype USNM 152218c; 45-51, dorsal, ventral, posterior, side, and anterior views, XI, X3, adult holotype USNM 152218d; 52-57, dorsal, ventral, side and posterior views of slightly deformed adult paratype, XI, X3, USNM 152218b. [Skinner Ranch Formation (base = Decie Ranch Mem? ber), USNM 705a.] NUMBER 21 2415 PLATE 566.?Stenoscisma. 2416 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 567 Stenoscisma Stenoscisma oblisum, new species: 1-7, Dorsal, ventral, side, anterior, and posterior views, XI, X2, nepionic paratype USNM 152284a; 14-20, dorsal, ventral, side, anterior and posterior views, XI, X2, elongate juvenile paratype USNM 152263a; 21-27, dorsal, ventral, side, anterior, and posterior views, XI, X2, juvenile paratype USNM 152284b; 42-48, dorsal, ventral, anterior, posterior, and side views, XI, X2, juvenile paratype USNM 152284c; 49-55, dorsal, ventral, side, anterior, and posterior views, XI, X2, adult paratype USNM 152263b; 56-61, dorsal, ventral, side, and anterior views, XI, X2, elongate adult paratype USNM 152284d; 62-68, dorsal, ventral, side, anterior, and posterior views, XI, X2, adult holotype USNM 152284c [Capitan Formation, USNM 739.] 8-13, Ventral, dorsal and side views, XI, X2, nepionic paratype USNM 152264a; 28-34, dorsal, ventral, side, posterior, and anterior views, XI, X2, juvenile paratype USNM 152264b; 35-41, dorsal, ventral, side, anterior, and posterior views, XI, X2, juvenile paratype USNM 152264c [Capitan Formation, USNM 740.] NUMBER 21 2417 PLATE 567.?Stenoscisma. 2418 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 568 Stenoscisma Stenoscisma pansum, new species: 1-7, Dorsal, ventral, side, anterior, and posterior views, XI, X2, juvenile paratype USNM 152258a; 8-14, dorsal, ventral, side, anterior, and posterior views, XI, X2, paratype USNM 152258b; 17-23, dorsal, ventral, anterior, posterior, and side views, XI, X2, adult paratype USNM 152258c; 33-39, dorsal, ventral, side, anterior, and posterior views, XI, X2, adult holotype USNM 152258d. [Skinner Ranch Formation (base), USNM 712p.] 15-16, Dorsal and side views, XI, young adult paratype USNM 152254. [Skinner Ranch For? mation (Decie Ranch Member), USNM 707w.] 24-27, Dorsal, ventral, side, and anterior views, XI, adult paratype USNM 152257a; 28-32, dorsal, ventral, side, and anterior views, Xl.5, adult paratype USNM 152257b. [Skinner Ranch Formation (base), USNM 711d.] 40-42, Dorsal and side views, XI, X2, adult paratype USNM 152255. [Skinner Ranch For? mation (Sullivan Peak Member) USNM 708c] NUMBER 21 2419 PLATE 568.?Stenoscisma. 2420 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 569 Stenoscisma Stenoscisma peneleve, new species: 1-9, Dorsal views, X3, XI, X2, and ventral, side posterior, and anterior views, XI, X2, juvenile paratype USNM 152256a; 10-18, dorsal views, X3, XI, X2, and ventral, side, posterior, and anterior views, XI, X2, juvenile paratype USNM 152256b; 19-27, dorsal views, X3, XI, X2, and ventral, side, posterior, and anterior views, XI, X2, young adult paratype USNM 152256c [Neal Ranch Formation, USNM 715b.] 28-36, Dorsal views, X3, XI, X2, and ventral, side, posterior, and anterior views, XI, X2, adult holotype USNM 152261a; 37-44, dorsal, ventral, side, posterior, and anterior views, XI, X2, weathered paratype USNM 152261b. [Lenox Hills Formation, USNM 709t.] Stenoscisma thevenini R. E. King (not Kozlowski): 45-52, Dorsal, ventral, side, posterior, and anterior views, XI, X2, specimen illustrated by R. E. King (1931, pi. 34: fig. 28a-c), YPM 12695. ["Leonard Formation," R. E. King 123.] NUMBER 21 2421 PLATE 569.?Stenoscisma. 46 1 48 50 3 * 52 51 2422 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 570 Stenoscisma [All XI] Stenoscisma problematicum, new species: 1-4, Ventral, side, posterior, and anterior views, nepionic paratype USNM 154581a; 5-9, dorsal, ventral, side, posterior, and anterior views, juvenile paratype USNM 154581b; 20-21, dorsal and side oblique views, paratype with stolidium USNM 154581c; 22-24, dorsal, side, and anterior views, adult paratype USNM 154581d; 25-29, dorsal, ventral, side, posterior, and anterior views, adult paratype USNM 154581e; 30-34, dorsal, ventral, side, posterior, and anterior views, adult paratype USNM 154581f; 35-39, dorsal, ven? tral, anterior, posterior, and side views, adult holotype USNM 154581g. [Skinner Ranch Forma? tion (Decie Ranch Member), USNM 727u.] 10-14, Dorsal, ventral, side, posterior, and anterior views, juvenile paratype USNM 152197b; 15-19, Dorsal, ventral, side, posterior, and anterior views, young adult paratype USNM 152197c [Skinner Ranch Formation (Decie Ranch Member), USNM 707a.] 40-44, Dorsal, ventral, side, anterior, and posterior views, adult paratype USNM 154582. [Cibolo Formation (Breccia Zone of Udden), USNM 728-1.] NUMBER 21 2423 PLATE 570.?Stenoscisma. 2 4 2 4 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 571 Stenoscisma Stenoscisma pyraustoides, new species: 1-7, Dorsal, ventral, side, posterior, and anterior views, XI, Xl.5, juvenile paratype USNM 152220b; 8-14, dorsal, ventral, side, posterior, and anterior views of adult paratype with stolidium, XI, Xl.5, USNM 152220c; 15-20, dorsal, ventral, side and posterior views, XI, Xl.5, young adult paratype USNM 152219a; 21-22, side and interior views of ventral valve, X2, paratype USNM 152219b; 30-31, side oblique and facing views of dorsal valve with camarophorium, cardinalia, and pallial trunks, X2, paratype USNM 152220k; 37, fragment of anterior margin in ventral view, Xl.5, showing exterior of broken ventral stolidium, and inside of opposing dorsal stolidium with growth lines and narrowly spaced pallial lines, paratype USNM 152219c [Skinner Ranch Formation (base), USNM 705a.] 23-29, Dorsal, ventral, side, posterior, and anterior views, XI, Xl.5, adult paratype USNM 152221a; 32-36, dorsal, ventral, side, and posterior views, XI, Xl.5, large juvenile paratype USNM 152221b. [Skinner Ranch Formation (base), USNM 705b.] NUMBER 21 2425 PLATE 571.?Stenoscisma. 2426 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 572 Stenoscisma Stenoscisma pyraustoides, new species: 1-6, Dorsal, ventral, right side, left side, and anterior views, XI (figure 2, Xl.5), adult holotype with cemented coral, USNM 152220i; 12-17, dorsal, ventral, posterior, side, and anterior views, Xl.5 (figure 14, XI), thin-shelled adult paratype USNM 152219d. [Skinner Ranch Formation (base), USNM 705a.] 7-11, Dorsal, ventral, side, and anterior views, XI, (figure 8, Xl.5), large adult paratype USNM 152225.[ Hess Formation (Taylor Ranch Member), USNM 716o.] NUMBER 21 2427 PLATE 572.?Stenoscisma. 2 4 2 8 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 573 Stenoscisma [All XI, Xl.5] Stenoscisma renode, new species: 1-7, Dorsal, ventral, side, anterior, and posterior views, nepionic paratype USNM 152210c; 8-13, dorsal ventral, side, posterior, and anterior views, juvenile paratype USNM 152210e; 14-20, dorsal, ventral, posterior, side, and anterior views, young adult paratype with stolidium, USNM 152209c; 21-27, dorsal, ventral, side, posterior, and anterior views, young adult paratype with several stolidia, USNM 152209d; 28-34, dorsal, ven? tral, side, anterior, and posterior views, adult paratype USNM I52209e; 35-41, dorsal, ventral, posterior, side, and anterior views, adult paratype USNM 152209f; 42-48, dorsal, ventral, side, posterior, and anterior views, adult paratype USNM 152209g. [Word Formation (limestone lens between Willis Ranch and Appel Ranch members), USNM 706b.] NUMBER 21 2429 PLATE 573.?Stenoscisma. 2 4 3 0 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 574 Stenoscisma [All XI, Xl.5] Stenoscisma renode, new species: 1-8, Dorsal, ventral, left side, posterior, anterior, and right side, narrow adult paratype with multiple stolidia and epifauna, USNM 152209a; 9-15, dorsal, ventral, anterior, posterior, and side views, adult holotype 152210i; 16-22, dorsal, ventral, side, anterior, and posterior views, adult paratype USNM 152209b. [Word Formation (limestone lens between Willis Ranch and Appel Ranch members), USNM 706b.] NUMBER 21 2431 PLATE 574.?Stenoscisma. 2432 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 575 Stenoscisma Stenoscisma renode, new species: 1-2, Dorsal interior, X2, and enlargement, X4, of camaro? phorium and cardinalia, paratype USNM 152211a; 5-6, enlargement of camarophorium, X4, showing muscle marks and cardinal process with striae, and dorsal interior, X2, paratype USNM 152211b; 12-13, ventral interior, X2, and enlargement, X4, of spondylium, showing muscle marks, paratype USNM 152211c; 19, articulated shell broken to show underside of camarophorium, its septum, underside of hinge plate, the crura, and part of ventral spon? dylium, X2, paratype USNM 15221 Id. [Word Formation (middle part of China Tank Member), USNM 706c] 3-4, Dorsal, interior, X2, and enlargement, X4, of hinge plate, cardinal process, and camaro? phorium with muscle marks, paratype-USNM 152209h; 7-8, enlarged cardinal region, X4, and dorsal valve, X2, elongate muscle marks and intercamarophorial plate apparent, paratype USNM 152209i; 9, interior view of ventral valve, X2, showing spondylium with muscle marks, paratype USNM 152209j; 10 interior view of pedicle valve, X2, paratype USNM 152209k; 11, interior of another pedicle valve, X2, paratype USNM 152209p; 14-15, dorsal interior, X2, and enlargement, X4, of cardinalia and camarophorium, paratype USNM 152209-1; 16, side view of articulated posterior part of shell with spondylium, camarophorium, and crura, X2, paratype USNM 152209m; 17, anterior oblique view of interior, X2, showing camarophorium and spon? dylium, paratype USNM 152209n; 18, side view of articulated fragment, X2, showing close juxtaposition of camarophorium and spondylium, paratype USNM 152209o. [Word Formation (limestone lens between Willis Ranch and Appel Ranch members), USNM 706b.] NUMBER 21 2433 PLATE 575.?Stenoscisma. 2434 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 576 Stenoscisma Stenoscisma trabeatum, new species: 1-7, Dorsal, ventral, side, anterior, and posterior views, XI, Xl.5, adult paratype USNM 152230a; 15-21, dorsal, ventral, side, anterior, and posterior views, XI, Xl.5 adult paratype USNM 152230c; 22-28, dorsal, ventral, side, posterior, and anterior views, XI, XLS, adult holotype USNM 152230b. [Bell Canyon Formation (Lamar Member), USNM 738.] 8-14, Dorsal, ventral, side, anterior, and posterior views, XI, Xl.5, adult paratype USNM 154586. [Bell Canyon Formation (Lamar Member), AMNH 347.] 29-30, ventral and posterior views of posterior part of ventral valve, Xl.5, showing postero? lateral pockets, paratype USNM 154587. [Bell Canyon Formation (Lamar Member), AMNH 37.] 31, Interior view of ventral valve with posterolateral pockets, Xl.5, paratype USNM 154588. [Bell Canyon Formation (Lamar Member), USNM 725c] NUMBER 21 2435 PLATE 576.?Stenoscisma. $$i] 2436 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 577 Stenoscisma Stenoscisma venustum (Girty): 1-8, Dorsal, ventral, side, posterior, and anterior views, XI, X2, holotype USNM 118557. [Possibly the "Delaware Mountain Formation" Comanche Canyon, Glass Mountains, USGS 3763 (green); correct formation and locality unknown (see Girty, 1909:512)] Stenoscisma trabeatum, new species: 9-15, Dorsal, ventral, side, anterior, and posterior views, XI, Xl.5, of fragile and slightly crushed adult paratype USNM 152231a; 16-21, ventral, dorsal, ventral oblique, posterior, and anterior views of adult paratype with hole in ventral valve, XI, Xl.5, showing crura and camarophorium inside, USNM 152230d; 23, ventral view of shell with part of ventral valve broken to expose cardinalia and camarophorium of dorsal valve, Xl.5, paratype USNM 152231b; 24, side view of broken shell, Xl.5, showing profile of camaro? phorium, paratype USNM 152231c. [Bell Canyon Formation (Lamar Member), USNM 738.] 22, Interior view of dorsal valve with broad stolidium, Xl.5, showing cardinalia and broken camarophorium with intercamarophorial plate, USNM 154585a. [Bell Canyon Formation (Lamar Member), USNM 728p.] NUMBER 21 2437 PLATE 577.?Stenoscisma. 2438 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 578 Stenoscisma Stenoscisma triquetrum, new species: 1-8, Dorsal, XI, X2, X3, and side, ventral, posterior, and anterior views, XI, X2, nepionic paratype USNM 152190a; 9-16, dorsal, XI, X2, X3, and ventral, side, anterior, and posterior views, XI, X2, nepionic paratype 152190b; 17-24, dorsal, XI, X2, X3, and side, posterior, ventral, and anterior views, XI, X2, nepionic paratype USNM 152190c; 25-32, dorsal, XI, X2, X3, and side, ventral, posterior, and anterior views, XI, X2, nepionic paratype USNM 152190d; 33-39, dorsal, side, ventral, posterior, and anterior views, XI, X2, juvenile paratype USNM 152190e; 40-46, dorsal, side, ventral, posterior, and anterior views, XI, X2, juvenile paratype USNM 152190f; 47-53, dorsal, side, ventral, anterior, and posterior views, XI, X2, juvenile paratype USNM 152l90g; 54-60, dorsal, side, ventral, anterior, and posterior views, XI, X2, juvenile paratype USNM 152190h; 61-67, dorsal, ventral, side, anterior, and posterior views, XI, X2, juvenile paratype USNM 152190i; 68-76, dorsal, ventral, right side, left side, posterior, and anterior views, XI, Xl.5, adult paratype USNM 152190J. [Road Canyon Formation (base), USNM 702c] 77, Side oblique view, Xl.5, showing camarophorium, crus, and spondylium, paratype USNM 142545 (illustrated by Grant, 1965, pi. 23: fig. 4, as S. venustum (Girty)); 79, oblique interior view of dorsal valve with camarophorium, crura, and cardinal process, X2, paratype USNM 152334L [Road Canyon Formation, USNM 719x.] 78, Side oblique view of interior of broken shell, X2, showing camarophorium, crura, and spondylium, paratype USNM 152318b. [Cathedral Mountain Formation, USNM 702.] NUMBER 21 2439 PLATE 578.?Stenoscisma. 2440 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 579 Stenoscisma Stenoscisma triquetrum, new species: 1, Dorsal view, X2, nepionic paratype USNM 142533. 2. side view, X2 nepionic paratype USNM 142534; 3-4, dorsal and side views, X2, nepionic paratype USNM 142535; 5, dorsal view, X2, nepionic paratype USNM 142536; 6, side view, X2, nepionic paratype USNM 142537; 7-8, dorsal and side views, X2, juvenile paratype USNM 142538; 9-10, dorsal and side views, X2, juvenile paratype USNM 142540; 11-13, dorsal, ante? rior, and side views, X2, juvenile paratype USNM 142541; 14-20, dorsal, ventral, posterior, side, and anterior views, XI, X2, young adult paratype with epifauna, USNM 152190k; 22-25, dorsal view, Xl.5, and anterior, posterior, and side views, XI, adult paratype USNM 142528; 26-32, dorsal, ventral, side, anterior, and posterior views, XI, Xl.5, mature adult paratype USNM 152190-1. [Road Canyon Formation (base), USNM 702c] 21, Dorsal view, XI, adult paratype USNM 152334c [Road Canyon Formation, USNM 7I9x.] NUMBER 21 2441 PLATE 579.?Stenoscisma. 2442 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 580 Stenoscisma Stenoscisma triquetrum, new species: 1-4, Dorsal, side, posterior, and anterior views, XI, young adult paratype USNM 154589a; 5-8, dorsal, ventral, side, and posterior views, XI, adult para? type USNM 154589b; 9-15, dorsal, ventral, side, anterior, and posterior views, XI, Xl.5, adult paratype USNM 154589c. [Road Canyon Formation (lower part), USNM 726za.] 16-22, Dorsal, ventral, side, anterior, and posterior views, XI, Xl.5, adult paratype USNM 152320b; 23-29, dorsal, ventral, side, anterior, and posterior views, XI, Xl.5, adult paratype USNM 152320c [Cathedral Mountain Formation, USNM 702b.] 30-36, Dorsal, ventral, side, posterior, and anterior views, XI, Xl.5, adult paratype USNM 152334g. [Road Canyon Formation, USNM 719x.] NUMBER 21 2443 PLATE 580.?Stenoscisma. k4V Q M H ? llldS ' * - A Mai An 2 4 4 4 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 581 Stenoscisma Stenoscisma triquetrum, new species: 1-7, Dorsal, ventral, posterior, side and anterior views, XI, Xl.5, adult paratype USNM 152320a. [Cathedral Mountain Formation, USNM 702b.] 8-12, Dorsal, ventral, and side views, XI, Xl.5, adult paratype USNM 152318c. [Cathedral Mountain Formation, USNM 702.] 13-19, Dorsal, ventral, side, anterior, and posterior views, XI, Xl.5, adult holotype, USNM 152l91u. [Road Canyon Formation (base), USNM 702c] NUMBER 21 2445 PLATE 581.?Stenoscisma. 2446 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 582 Stenoscisma Stenoscisma triquetrum, new species: 1-7, Dorsal, ventral, anterior, side, and posterior views, XI, XI.5, large juvenile paratype USNM 152334b. [Road Canyon Formation, USNM 7l9x.] 8, Interior view of broken paratype, X2, USNM 142526. [Road Canyon Formation (base), USNM 72lo.] 9, Dorsal interior, XI, showing camarophorium and cardinalia, paratype USNM 152318d; 10, side oblique view of shell broken to show relationship of camarophorium and crura to spondylium, Xl.5, paratype USNM 142547; 11-12, side and facing views of dorsal interior, X2, showing camarophorium, crura, and cardinalia, paratype USNM 142543; 14, side oblique view of broken shell, X2, showing spondylium and relatively low camarophorium, paratype USNM 152318a; 15, ventral interior, XI, showing spondylium and genital grooves, paratype USNM 142531; 16, ventral interior, X2, juvenile paratype USNM 142542. [Cathedral Mountain For? mation, USNM 702.] 13, Interior view of articulated posterior part of shell, covered with drusy quartz, X2, show? ing internal structures, paratype USNM 152190m; 17-22, dorsal view, XI, Xl.5, and ventral, side, posterior, and anterior views, X2, adult paratype USNM 152190n. [Road Canyon Forma? tion (base), USNM 702c] NUMBER 21 2447 PLATE 582.?Stenoscisma. 2 4 4 8 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 583 Stenoscisma [All XI and X2] Stenoscisma species undetermined: 1-7, Dorsal, ventral, side, posterior, and anterior views, figured specimen, USNM 152317. [Bell Canyon Formation (Lamar Member), USNM 738.] Stenoscisma species 2: 8-14, Dorsal, ventral, side, posterior, and anterior views, paratype USNM 152227a; 15-21, dorsal, ventral, side, posterior, and anterior views, paratype USNM 152227b. [Lenox Hills Formation, USNM 716r.] Stenoscisma species 1: 22-28, Dorsal, ventral, side, posterior, and anterior views, paratype USNM 152280a; 29-35, dorsal, ventral, side, anterior, and posterior views, paratype USNM 152280b. [Hueco Formation, USGS 9999.] 36-42, Dorsal, ventral, side, anterior, and posterior views, USNM 152279a. [Lenox Hills For? mation, USNM 730a.] NUMBER 21 2449 PLATE 583.?Stenoscisma. 11 10 l#ji V ; '?V v.; ? l t \ \ ?- A ! 17 2532 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 625 Spiriferinaella Spiriferinaella limata, new species: 1-2, Dorsal and ventral views of juvenile with left side broken off, XI, paratype USNM 152943b; 3-4, exterior and interior views of juvenile brachial valve, XI, paratype USNM 152943c; 5-6, exterior and interior views of adult brachial valve, XI, paratype USNM 152943f; 7-8, exterior and interior views of broken brachial valve, XI, holotype USNM 152943e; 9, interior view of fragment of thickened pedicle valve, X2, paratype USNM 152943g; 10, interior view of fragment of pedicle valve, X2, paratype USNM 152943d. [Word Formation (China Tank Member, USNM 706c] Spiriferinaella scalpata, new species: 11-14, Internal and dorsal and ventral external views, XI, shown articulated and disarticulated, adult holotype USNM 152947a; 27, interior view, XI, fragment of pedicle valve, paratype USNM 152947b. [Word Formation (lens between Willis Ranch and Appel Ranch members), USNM 706b.] 15-18, Posterior and ventral views, XI, X3, young juvenile paratype USNM 152946a; 19-20, dorsal and ventral views, XI, young adult paratype USNM 152946b. [Word Formation (Appel Ranch Member), USNM 706d.] 21-23, Interior and exterior views, XI, and interior cardinal view, X3, of alate brachial valve, paratype USNM 152945b; 24-26, interior and exterior views, XI, and detailed exterior view, X4, of fragment of pedicle valve, paratype USNM 152945c; 28, posterior view of pedicle valve with delthyrial cover, X3, paratype USNM 152945d. [Word Formation (Appel Ranch Member), USNM 715i.] NUMBER 21 2533 PLATE 625.?Spiriferinaella. ? ? ? ? > WP~~~ v ' \ / j YJf/ 2534 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 626 Spiriferinaella, Eridmatus, and Spiriferella Spiriferinaella medialis, new species: 1-5, Dorsal, ventral, anterior, posterior, and side views, XI, holotype USNM 152944a. [Cherry Canyon Formation (Getaway Member), USNM 728.] Spiriferinaella species undetermined: 6, 7, Dorsal and posterior views of fragmentary shell, XI, USNM 154549. [Word Formation, USNM 731u.] 8, 9, ventral and posterior views of fragmentary shell, XI, USNM 154550. [Word Formation, USNM 731m.] Eridmatus marathonensis, new species: 10-14, Dorsal, ventral, side, anterior, and posterior views, XI, juvenile paratype USNM 152977b; 15-19, dorsal, ventral, side, posterior, and anterior views, XI, exfoliated holotype USNM 152977a; 20, polished transverse section cut about midlength to show form of spire, XI, paratype USNM 152977c. [Gaptank Formation, USNM 701v.] Spiriferella calcarata, new species: 21, Ventral view of juvenile pedicle valve, XI, paratype USNM 152948]; 22, Ventral view of juvenile pedicle valve, XI, paratype USNM 152948-1; 23-24, dorsal and ventral views, XI, juvenile paratype USNM 152948r; 25-26, exterior and interior views of juvenile brachial valve, XI, paratype USNM 152948u; 27, anteroventral view of shell broken to show spiralium, XI, paratype USNM 152948q; 28, ventral view, adult pedicle valve, XI, paratype USNM 152948m; 29-30, interior and exterior views of young adult brachial valve, XI, paratype USNM 152948v; 31-33, exterior and interior views, XI, and detail of exterior ornament, X4, of adult brachial valve, paratype USNM 152948t; 34-36, dorsal and ventral views, XI, and detail of ornament of pedicle valve, X4, of adult holotype USNM 152948s. [Word Formation (Willis Ranch Member), USNM 706c] NUMBER 21 2535 PLATE 626.?Spiriferinaella, Eridmatus, and Spiriferella. " ^ 2 5 3 6 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 627 Spiriferella [All XI] Spiriferella clypeata, new species: 1, 2, Dorsal and ventral views of juvenile paratype USNM 152950d; 3, 4, exterior and interior views of juvenile brachial valve, paratype USNM 152950r; 5, interior view of brachial valve, paratype USNM 152950p; 6, 7, exterior and interior views of young adult pedicle valve, paratype USNM 152950s; 8, 9, exterior and interior views of young adult pedicle valve, paratype USNM 152950t; 12-13, exterior and interior views of young adult brachial valve, paratype USNM 152950q; 14, dorsal view of extensively bored adult, paratype USNM 152950m; 15, 16, ventral and side views of adult, paratype USNM 152950n; 19-22, dorsal, side, ventral, and posterior views of slightly crushed holotype USNM 152950o. [Word Forma? tion (Appel Ranch Member), USNM 715L] 10, 11, Exterior and interior views of large pedicle valve, paratype USNM 154551a. [Word Formation (Appel Ranch Member), USNM 719z.] 17, 18, Dorsal and ventral views of large adult, paratype USNM 154552a (for enlargement see Plate 628: figure 37). [Word Formation (Appel Ranch Member), USNM 727j.] NUMBER 21 2537 PLATE 627.?Spiriferella. 2538 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 628 Spiriferella Spiriferella embrithes, new species: 1-5, Dorsal, ventral, side, posterior, and anterior views, XI, juvenile paratype USNM 152951d; 6-10, dorsal, ventral, posterior, side, and anterior views, XI, young adult paratype USNM 152951g; 11, interior view of pedicle valve, XI, paratype USNM 152951h; 12, interior view of broken brachial valve, XI, paratype USNM 152951J; 13-17, dorsal, ventral, anterior, posterior and side views, XI, adult holotype USNM 15295H; 18-19, dorsal and anteroventral views, XI, showing mesial coils of spiralium, young adult paratype USNM 152951k. [Word Formation (China Tank Member), USNM 706c] Spiriferella sulcifer (Shumard): 20-23, Dorsal, ventral, side, and posterior views of young adult shell, XI, hypotype USNM 152959a; 33-34, interior views of pedicle valve, XI, X2, hypotype USNM 152959b; 35-36, interior views of brachial valve, XI, X2, hypotype USNM 152959c. [Bell Canyon Formation (Rader Member), USNM 725f.] 24-28, Dorsal, ventral, side, posterior, and anterior views of young adult shell, XI, neotype USNM 152958a. [Bell Canyon Formation (Rader Member), USNM 725g.] 29-30, Exterior and interior views, of brachial valve, XI, hypotype USNM 152957q; 31-32, exterior and interior views of pedicle valve, XI, hypotype USNM 152957o. [Bell Canyon For? mation (Hegler Member), USNM 731.] Spiriferella clypeata, new species: 37, Exterior view of brachial valve, portion enlarged to show ornament, X4, paratype USNM 154552a (see Plate 627: figures 17, 18). [Word Formation (Appel Ranch Member), USNM 727j.] NUMBER 21 2539 PLATE 628.?Spiriferella. 23 , 2540 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 629 Spiriferella Spiriferella gloverae, new species: 1, 2, Ventral and dorsal views, XI, juvenile paratype USNM 152952r; 3, 4, exterior and interior views of juvenile pedicle valve, XI, paratype USNM 152952v; 5, 6, exterior and interior views of juvenile brachial valve, XI, paratype USNM 152952q; 7, 8, exterior and interior views of juvenile brachial valve, XI, paratype USNM 152952u; 9-13, dorsal, ventral, side, anterior, and posterior views, XI, adult holotype USNM 152952x; 14-16, exterior views, X4, XI, and interior view, XI, of brachial valve, paratype USNM 152952s; 17-19, exterior and interior views, XI, and exterior view, X4, of pedicle valve enlarged to show orna? ment, paratype USNM 152952w; 20, 21, exterior views of brachial valve, XI, X4, paratype USNM 152952t. [Cherry Canyon Formation (Getaway Member), USNM 728.] NUMBER 21 2541 PLATE 629.?Spiriferella. ,_ - r ; - '"?' *r< ^ - 2 5 4 2 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 630 Spiriferella Spiriferella gravis, new species: 1-5, Dorsal, ventral, side, posterior, and anterior views, XI, juvenile paratype USNM I52953g; 6-10, dorsal, ventral, side, posterior, and anterior views, XI, young adult paratype USNM 152953k; 11-16, dorsal, ventral, side, posterior, and anterior views XI, and dorsal view, X4, enlarged to show ornament, adult paratype USNM 152953m; 17-21, dorsal, ventral, side, anterior, and posterior views, XI, adult holotype USNM I52953r; 22-26, dorsal, ventral, side, anterior, and posterior views, XI, elongate adult paratype USNM 152953s; 27, interior view of pedicle valve with attached spat, XI, paratype USNM 152953c'; 28, interior view of brachial valve, XI, paratype USNM 152953a'; 29, interior view of pedicle valve, XI, paratype USNM 152953d'; 30, 31, exterior and interior views of pedicle valve, XI, paratype USNM 152953b'; 32, side oblique view of broken shell with spire, XI, paratype USNM 152953f; 33, interior oblique view of pedicle valve, XI, paratype USNM 152953e'; 34, side oblique view of broken shell with spire, XI, paratype USNM 152953g/; 35-37, partial exterior view, X4, and exterior and interior views, XI, of brachial valve, paratype USNM 152953z; 38-40, exterior and interior views, XI, and exterior view, X4, to show ornamentation, paratype USNM 152953y. [Word Formation (lens between Willis Ranch and Appel Ranch members), USNM 706b.] NUMBER 21 2543 PLATE 630.?Spiriferella. 2544 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 631 Spiriferella and Martinia [All XI] Spiriferella propria, new species: 1-5, Dorsal, ventral, side, anterior, and posterior views, juvenile paratype USNM 152955d; 6-10, dorsal, ventral, posterior, anterior, and side views, juvenile paratype USNM 152955c [Word Formation (Appel Ranch Member), USNM 706d.] 11-15, Dorsal, ventral, anterior, posterior, and side views of large adult, holotype USNM 152956a. [Word Formation (Appel Ranch Member), USNM 719z.] Spiriferella levis, new species: 16, 17, Exterior and interior views of pedicle valve, paratype USNM I52954h; 18, 19, exterior and interior views of brachial valve, paratype USNM 152954n; 20, 21, exterior and interior views of pedicle valve, holotype USNM 152954k. [Word Formation (lens between Willis Ranch and Appel Ranch members), USNM 706b.] Spiriferella sulcifer (Shumard): 22-24, Dorsal, ventral and side views of shell illustrated by King (1931, pi. 40: figs. 2a-b), YPM 12414; 25-26, dorsal and ventral views of shell illustrated by King (1931, pl. 39: figs. 6a-c), YPM 12414 (sic). [Word Formation (Appel Ranch Member), R. E. King 247.] Martinia fucina, new species: 27-31, Dorsal, ventral, side, posterior, and anterior views, juvenile paratype USNM 154553a; 32-36, Dorsal, ventral, side, anterior, and posterior views, adult holotype USNM 154553b. [Bone Spring Formation, AMNH 634.] 37, 38, Exterior and interior views of pedicle valve, paratype USNM 152394g; 39, 40, exterior and interior views of pedicle valve, paratype USNM 152394f; 41, exterior view of brachial valve with radial stripes, paratype USNM 152394m; 42, interior view of brachial valve, paratype USNM 152394k. [Bone Spring Formation, USNM 728f.] Martinia causaria, new species: 43, Exterior view of pedicle valve, paratype USNM 152395a. [Cherry Canyon Formation (Getaway Member), USNM 728.] 44, Exterior view of brachial valve, holotype USNM 152397-1; 45, exterior view of large pedicle valve with slot shaped barnacle borings, paratype USNM 152397m. [Cherry Canyon Formation (Getaway Member), USNM 732.] NUMBER 21 2545 PLATE 631.?Spiriferella and Martinia. 2546 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 632 Eliva Eliva shumardi, new species: [all hypotypes]: 1-5, Dorsal, ventral, side, posterior, and anterior views of small shell, XI, USNM 118588a (illustrated by Girty, 1909, pl. 13: figs. 6-6a); 6-10, dorsal, ventral, side, posterior, and anterior views of small shell, XI, USNM 118588b (illustrated by Girty, 1909, pl. 13: figs. 4-4a); 11-15, dorsal, ventral, side, posterior, and anterior views of average size shell, XI, USNM 118588c (illustrated by Girty, 1909, pl. 13: figs. 2-2d). [Capitan Formation, USGS 2926 (green).] 16-20, Dorsal, ventral, side, posterior, and anterior views, XI, young adult paratype USNM 154567a; 25-29, dorsal, ventral, side, posterior, and anterior views, XI, adult holotype USNM 154567b. [Capitan Limestone, USNM 725k.] 21-22, Ventral and posterior views', XI, young adult paratype USNM 154568a; 23, 24, exterior and interior views of pedicle valve, XI, paratype USNM 154568b; 30, 31, exterior and interior views of brachial valve, XI, paratype USNM 154568c; 32, 33, exterior and interior views of pedicle valve, XI, paratype USNM 154568d; 34, 35, exterior and interior views of pedicle valve, XI, paratype USNM 154568e; 42, 43, interior views, XI, X2, fragment of brachial valve, para? type USNM 154568f; 44-46, exterior view, XI, interior views, X2, XI, brachial valve, paratype USNM 154568g; 47-49, exterior and interior views, XI, interior view, X2, brachial valve, para? type USNM 154568h. [Bell Canyon Formation, (Lamar Member), USNM 728p.] 36-38, Exterior view, XI, interior views, XI, X2, pedicle valve, paratype USNM 154569a; 39-41, exterior view, XI, interior views, X2, XI, brachial valve, paratype USNM 154569b; 50-52, exterior view, XI, interior views, X2, XI, distorted brachial valve, paratype USNM 154569c; 53-54, interior views, XI, X2, pedicle valve, paratype USNM 154569d. [Bell Canyon Formation, (Lamar Member), USNM 725c] NUMBER 21 2547 PLATE 632.?Eliva. ^ 54 2548 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 633 Elivina, Rallacosta, and Eliva Elivina compacta (Girty): 1-5, Ventral, dorsal, side, posterior, and anterior views of young adult shell, XI, hypotype USNM 152966b; 6-10, ventral, dorsal, side, posterior, and anterior views of adult shell, XI, hypotype USNM 152966c; 16-20, ventral, dorsal, side, anterior, and posterior views of adult shell, hypotype USNM 152966d. [Bell Canyon Formation (Lamar Member), USNM 737a.] 11-15, Ventral, dorsal, side, anterior, and posterior views, XI, holotype USNM 118589 (illus? trated by Girty, 1909, pl. 13: figs. 7-7d). [Capitan Formation, USGS 2926 (green).] Elivina annectens, new species: 21-25, Ventral, dorsal, side, posterior, and anterior views, XI, young adult holotype USNM 152963b. [Bell Canyon Formation (Pinery Member), USNM 731.] 26-28, Exterior and interior views, XI, and interior view, X2, of pedicle valve, paratype USNM 154563a. [Bell Canyon Formation (Rader Member), USNM 725g.] 29-31, Exterior and interior views, XI, and interior view, X2, of brachial valve, paratype USNM 154564a; 32-34, interior views, X2, XI, and exterior view, XI, of pedicle valve, para? type USNM 154564b; 35-37, exterior and interior views, XI, and interior view, X2, of brachial valve, paratype USNM 152964a. [Bell Canyon Formation (Hegler or Pinery Member), USNM 733.] Rallacosta species 2: 38, Interior view of pedicle valve, XI, USNM 154958. [Bone Spring Forma? tion, AMNH 625.] Eliva inflata, new species: 39-43, Ventral, dorsal, side, posterior, and anterior views, XI, young adult paratype USNM 152887c; 44-48, ventral, dorsal, anterior, posterior, and side views, XI, adult paratype USNM 152887f; 49-53, ventral, dorsal, side, posterior, and anterior views, XI, adult holotype USNM 152887j. [Capitan Limestone, USNM 750a.] NUMBER 21 2549 PLATE 633.?Elivina, Rallacosta, and Eliva. Ji < J J * ' ? j 3 4 11 12 10 19 18 20 IF 7 38 \ \ 'M 39 40 { 41 42 43 2550 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 634 Elivina Elivina detecta, new species: 1-5, Ventral, dorsal, side, posterior, and anterior views, XI, juve? nile paratype USNM 152968c; 6-10, ventral, dorsal, side, anterior, and posterior views, XI, juvenile paratype USNM 152968e; 11-15, ventral, dorsal, side, posterior, and anterior views, XI, young adult holotype USNM 152968f; 20-22, exterior and interior views, XI, and interior view, X2, of brachial valve, paratype USNM 152968h; 29-31, interior views X2, XI, and exterior view, XI, of pedicle valve, paratype USNM 152968J. [Bell Canyon Formation (Lamar Member), USNM 738b.] 16, 17, Exterior and interior views of pedicle valve, XI, paratype USNM 152969t; 18, 19, exterior and interior views of pedicle valve, XI, paratype USNM 152969u; 26-28, exterior and interior views, XI, and interior view, X2, of brachial valve, paratype USNM 152969n; 32-34, exterior and interior views, XI, and interior view, X2, of pedicle valve, paratype USNM 152969k; 35-37, interior and exterior views, XI, and interior view, X2, of pedicle valve, para? type USNM 152969s. [Bell Canyon Formation (Lamar Member), USNM 738.] 23-25, Exterior and interior, XI, and interior, X2, of a ventral valve, paratype USNM 154566. [Bell Canyon Formation (Lamar Member), AMNH 40.] 38-40, Interior, X2, and exterior and interior, XI, of pedicle valve, paratype USNM 154565a; 41-43, exterior and interior, XI, and interior, X2, of brachial valve, showing cardinalia, para? type USNM 154565b; 44-46, interior and exterior, XI, and interior, X2, of large pedicle valve, paratype USNM 154565c; 47-49, exterior and interior, XI, and interior, X2, of large brachial valve, paratype USNM 154565d. [Bell Canyon Formation (Lamar Member), AMNH 347.] NUMBER 21 2551 PLATE 634.?Elivina. 2552 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 635 Neophricadothyris Neophricadothyris bullata, new species: 1-4, Dorsal, ventral, side, and posterior views, XI, juvenile paratype USNM 152486v; 5-8, dorsal, ventral, side, and posterior view, XI , juvenile paratype USNM 152486d'; 9-13, dorsal, ventral, side, posterior, and anterior views, XI, young adult paratype USNM 152486-1'; 14-16, dorsal, posterior, and ventral views, XI, young adult paratype USNM 159486v'; 17-20, ventral, side, interior, and posterior views of young pedicle valve, XI, paratype USNM 152485i; 21-24, interior, ventral, side, and posterior views of adult pedicle valve, XI, paratype USNM 152485k; 25-26, ventral and dorsal oblique view, XI, of young adult shell and ventral interior view, XI, of shell broken to show primary lamella, paratype USNM 152485e; 27-30, ventral, interior, side, and posterior views of adult pedicle valve, XI, paratype USNM 152485J; 31-32, interior and posterior views of articulated beak region, XI, paratype shell USNM 152485d; 33-34, side and interior views of shell broken near socket, XI, showing one crural base, paratype USNM 152485c; 35-36, exterior and interior views of brachial valve with remnant of pedicle valve beak, XI, paratype USNM 152485a; 37- 38, exterior and interior views of brachial valve, XI, paratype USNM 152485f; 39-43, interior views of very young brachial valves, X12, showing beginnings of formation of spires, para? types, USNM 152485n-r; 44-45, exterior and interior views of brachial valve, XI, paratype USNM 152485g; 46-47, exterior and interior views of brachial valve, XI, paratype USNM 152485b; 48^9, exterior and interior views of brachial valve, XI, paratype USNM 152485h; 57-60, dorsal, ventral, posterior, and anterior views, XI, adult holotype USNM 152486g2; 61, interior view of pedicle valve, X3, showing delthyrial flanges, paratype USNM 152485-1; 63, exterior view of brachial valve with some spines preserved, X3, paratype USNM 152485s; 64, interior view of pedicle valve with delthyrial flanges, X3, paratype USNM 152485m. [Road Canyon Formation, USNM 702c] 50, Interior view of broken shell with part of spire held in place by undissolved limestone, XI, paratype USNM 152490a; 51, interior oblique view of broken shell with part of spire held by undissolved limestone, XI, paratype USNM 152490b. [Cathedral Mountain Formation, USNM 702un.] 52-56, Dorsal, ventral, side, anterior, and posterior views, XI, adult paratype USNM 154956. [Bone Spring Formation, AMNH 591.] 62, Dorsal view of juvenile shell with spines preserved, X3, paratype USNM 152483. [Cathe? dral Mountain Formation, USNM 702a.] NUMBER 21 2553 PLATE 635.?Neophricadothyris. n Iwtil ? ^2i 2554 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 636 Neophricadothyris Neophricadothyris catatona, new species: 1-4, Ventral, side, posterior, and anterior views of pedicle valve, XI, paratype USNM 154558a; 18-21, dorsal, anterior, side, and posterior views of brachial valve, XI, paratype USNM 154558b. [Bone Spring Formation, USNM 725c] 5-8, Ventral, posterior, anterior and side views of pedicle valve, XI, paratype USNM 152531a; 10-13, ventral, posterior, anterior, and side views of pedicle valve, XI, paratype USNM 152532k; 9, 14-16, dorsal tilted, dorsal, anterior, and side views of brachial valve, XI , paratype USNM 152531b; 26-28, ventral, side, and posterior views of large pedicle valve, XI, paratype USNM 152532m. [Skinner Ranch Formation (Decie Ranch Member), USNM 720c] 17, Exterior view of brachial valve, XI, paratype USNM 154559a. [Skinner Ranch Formation, USNM 726h.] 22-25, Dorsal, side, posterior, and anterior views, XI, holotype USNM 152994a. [Skinner Ranch Formation (lower), USNM 71 lq.] Neophricadothyris? species undetermined: 29-33, Ventral, anterior, posterior, and side views, X 1, and posterior oblique view, X2, of pedicle valve, USNM 154560a; 34-37, dorsal, side, anterior, adn posterior views of brachial valve, XI, USNM 154560b; 38-41, ventral, anterior, posterior, and side views of pedicle valve, XI, USNM 154560c; 42-45, dorsal, side, anterior, and posterior views of brachial valve, XI, USNM 154560d. [Cathedral Mountain Formation, USNM 721u.] NUMBER 21 2555 PLATE 636.?Neophricadothyris. 2556 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 637 Neophricadothyris Neophricadothyris cordata, new species: 1-4, Dorsal, ventral, side, and anterior views, XI, juvenile paratype USNM 152505a; 5-8, dorsal, ventral, side, and anterior views, XI, juvenile paratype USNM 152505b; 19-22, dorsal, ventral, side, and anterior views, XI, adult paratype USNM 152505i; 23-26, dorsal, ventral, side, and anterior views, XI, adult holotype USNM 152505]; 27-30, dorsal, ventral, side, and anterior views, XI, adult paratype USNM 152505k; 31-34, ventral, posterior, anterior, and interior views of pedicle valve, XI, paratype USNM 152505m; 35-38, dorsal, posterior, anterior, and interior views of brachial valve, XI, paratype USNM 152505n; 40, interior view of pedicle valve with deeply impressed heart-shaped muscle marks, XI, paratype USNM 152505o; 41, interior view of pedicle valve, XI, paratype USNM 152505p; 42, tilted interior view of pedicle valve, XI, paratype USNM 152505q; 45-46, interior views of brachial valve with distinct muscle marks, X2, XI, paratype USNM 152505r. [Road Canyon Formation, USNM 703d.] 9-13, Ventral, dorsal, side, anterior, and posterior views, XI, spiny paratype USNM 152506a; 14-18, dorsal, ventral, side, posterior, and anterior views, XI, paratype USNM 152506b; 39, side view of shell broken to show remnant of spire, XI, paratype USNM 152506c; 43-44, inte? rior views of brachial valve with muscle marks and brachiophore bases, XI, X3, paratype USNM 152506d; 47-48, interior views of pedicle valve with muscle marks, XI, X3, USNM 152506e. [Road Canyon Formation, USNM 707c] NUMBER 21 2557 PLATE 637.?Neophricadothyris. ??*'?' -MiV^.rV: - " < i ' " 48 ?36, 52 V 2 5 5 8 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 638 Neophricadothyris [All XI] Neophricadothyris crassibecca, new species: 1-4, Ventral, dorsal, side, and posterior views, juvenile paratype USNM 152995g; 5-9, ventral, dorsal, side, posterior, and anterior views, juvenile paratype USNM 152995n; 10-13, dorsal, side, posterior, and anterior views, young adult paratype USNM 152995t; 19-23, ventral, dorsal, side, posterior, and anterior views, adult holotype USNM 152995z. [Road Canyon Formation (base) USNM 721o.] 14-18, Ventral, dorsal, side, anterior, and posterior views, adult paratype USNM 152541a; 29, interior view of articulated posterior ends of both valves, pedicle valve up, paratype USNM 152541b; 30, interior view of brachial valve, paratype USNM 152541c; 31, interior view of brachial valve tilted backwards, paratype USNM 152541d; 32, interior view of brachial valve, paratype USNM 152541e; 33, interior view of pedicle valve, paratype USNM I52541L [Road Canyon Formation, USNM 7I9x.] 24-28, Ventral, dorsal, side, posterior, and anterior views, adult paratype USNM 154561. [Road Canyon Formation, USNM 721s.] Neophricadothyris conara, new species: 34, 35, Ventral and side oblique views, juvenile para? type USNM 152534d; 36, 37, exterior and interior views of brachial valve, paratype USNM 152534g; 38, 39, exterior and interior views of pedicle valve, paratype USNM 152534o; 40, 41, exterior and interior views of another pedicle valve, paratype USNM 152534q; 42, 43, exterior and interior views of pedicle valve, paratype USNM 152534r; 44, 45, exterior and interior views of brachial valve, paratype USNM 152534z; 46-50, ventral, dorsal, side, posterior, and anterior views, adult holotype USNM 152534p. [Word Formation (lens between Willis and Appel Ranch members), USNM 706b.] 51-54, Ventral, dorsal, anterior, and posterior views, large paratype USNM 154562a. [Word Formation (Appel Ranch Member), USNM 731 z.] Neophricadothyris species 1: 55-59, Ventral, dorsal, posterior, anterior, and side views of an unusually large specimen, USNM 153473. [Cathedral Mountain Formation (base), USNM 702.] NUMBER 21 2559 PLATE 638.?Neophricadothyris. ~_ 10 v> 14 *kZ? 2 5 6 0 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 639 Neoph rica dothyris [All XI] Neophricadothyris transversa, new species: 1-5, Ventral, dorsal, side, anterior, and posterior views, juvenile paratype USNM 152513c; 6-10, ventral, dorsal, side, posterior, and anterior views, young adult paratype USNM 152513h; 11-15, ventral, dorsal, side, posterior, and anterior views, atypically narrow paratype USNM 152513i; 22-26, ventral, dorsal, side, posterior, and anterior views, encrusted adult holotype USNM 152513k. [Neal Ranch Formation, USNM 701c] 152509b. [Neal Ranch Formation, USNM 701a.] 16, Interior view of posterior part of articulated shell, brachial valve up, paratype USNM 152509a; 17-21, ventral, dorsal, side, posterior, and anterior views, adult paratype USNM 152509b. [Neal Ranch Formation, USNM 701a.] 27, Exterior of a large pedicle valve, paratype USNM 152514b; 28, interior of incomplete specimen, paratype USNM 152514a. [Neal Ranch Formation, USNM 701d.] Neophricadothyris, species 2: 29-33, Ventral, dorsal, side, posterior, and anterior views of large shell, figured specimen USNM 153474; 34, side oblique view of silicified detached half of spire from preceding specimen. [Cathedral Mountain Formation, USNM 702-] NUMBER 21 2561 PLATE 639.?Neophricadothyris. 2562 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 640 Anomaloria [All hypotypes unless otherwise noted] Anomaloria anomala, Cooper and Grant: 1-4, Dorsal, side, anterior, and posterior views of juvenile, XI, USNM 152999b; 5-8, dorsal, side, anterior, and posterior views of juvenile, XI, USNM 152999e; 21, 45, interior view, XI, and interior view of hinge region of brachial valve, X3, USNM 152999g; 33-34, interior views of pedicle valve with delthyrial cover and distinct muscle marks, XI, X3, USNM 152999h; 42, 43, interior views of pedicle valve, XI , X3, USNM 152999i; 48, 49, interior views of brachial valve with sockets and muscle marks, XI, X3, USNM 152999J. [Bell Canyon Formation (Lamar Member), USNM 725c] 9-14, Dorsal, ventral, side, anterior, and posterior views, XI, posterodorsal view, X3, showing delthyrial cover, USNM 152998i; 15, interior view of brachial valve, XI, USNM 152998k; 16, interior view of pedicle valve, XI, USNM 152998m; 17, interior view of brachial valve, XI, USNM 152998n; 31, posterodorsal view of shell tilted to show delthyrial cover, X3, USNM 152998J; 32, interior view of pedicle valve, XI, USNM 152998p; 46^47, interior views of bra? chial valve, XI, X3, USNM 152998o. [Bell Canyon Formation (Lamar Member), USNM 738b.] 18, Interior view of pedicle valve, XI, USNM 153l97e; 19, interior view of brachial valve, XI, USNM I53197f; 20, interior view of brachial valve, XI, USNM 153197g; 35-37, dorsal and side views, XI, posterior view, X2, USNM 153197b; 38-41, dorsal, side, and anterior views, XI, posterior view, Xl.5, adult paratype USNM 153197c; 44, interior view of articulated cardinal area, X3, showing hinge teeth in sockets, paratype USNM 153197d. [Bell Canyon Formation (Lamar Member), USNM 728p.] 22-25, Dorsal, side, anterior, and posterior views of adult, XI, USNM 153001d. [Bell Canyon Formation (Lamar Member), USNM 737a.] 26-30, Dorsal, ventral, side, anterior, and posterior (pedicle valve up) views of adult, XI, USNM 153000f. [Capitan Formation, USNM 750.] NUMBER 21 2563 PLATE 640.?Anomaloria. 2 5 6 4 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 641 Astegosia [All hypotypes, all XI] Astegosia subquadrata (Girty): 1-4, Ventral, side, posterior, and anterior views of juvenile shell, USNM 154570a; 5-8, ventral, side, posterior, and anterior views of juvenile shell, USNM 154570b; 14-17, ventral, side, anterior, and posterior views of juvenile shell, USNM 154570c. [Bell Canyon Formation (Lamar Member), USNM 728p.] 9-13, Dorsal, ventral, side, posterior, and anterior views of juvenile shell, USNM 152996h; 18-22, dorsal, ventral, side, posterior, and anterior views of juvenile shell, USNM 152996-1; 23-27, dorsal, ventral, side, posterior, and anterior views of young adult shell, USNM 152996r; 28-32, dorsal, ventral, side, posterior, and anterior views of young adult shell, USNM 152996u; 33-37, dorsal, ventral, side, posterior, and anterior views of adult shell, USNM 152996y; 38-42, dorsal, ventral, side, anterior, and posterior views of adult shell, USNM 152996z. [Bell Canyon Formation (Lamar Member), USNM 738b.] 43^47, Dorsal, ventral, side, posterior, and anterior views of adult shell, USNM 152481b; 53-57, dorsal, ventral, side, posterior, and anterior views of large adult shell, USNM 15248H. [Capitan Formation, USNM 750.] 48-52, Dorsal, ventral, side, posterior, and anterior views of adult shell, USNM 152480q'. [Bell Canyon Formation (Lamar Member), USNM 737a.] NUMBER 21 2565 PLATE 641.?Astegosia. & c* * < # *ft? i 2566 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 642 Astegosia [All hypotypes] Astegosia subquadrata (Girty): 1, Interior view of pedicle valve, XI, USNM 152476a; 2, interior view of brachial valve, XI, USNM 152476b; 16, interior view of pedicle valve, X2, USNM 152476c [Bell Canyon Formation (Lamar Member), USNM 738b.] 3, Interior view of pedicle valve, XI, USNM 152474a; 10, interior view of pedicle valve, with many internally healed barnacle borings, XI, USNM 152474b. [Bell Canyon Formation (Lamar Member), USNM 738.] 4, Exterior view of pedicle valve, XI, USNM 154572a; 6, interior view of pedicle valve, Xl.5, USNM 154572b; 18, interior view of pedicle valve, Xl.5, USNM 154572c; 19, interior view of brachial valve, XI, USNM I54572d. [Bell Canyon Formation (Lamar Member), USNM 725c] 5, Interior view of pedicle valve, XI, USNM 154571a; 7, interior view of brachial valve, XI, USNM 154571e; 9, interior view of brachial valve, Xl.5, USNM 154571b; 11, interior view of brachial valve, XI, USNM 154571f; 13, interior view of pedicle valve, XI, USNM 154571c; 17, interior view of pedicle valve, Xl.5, USNM 154571d. [Bell Canyon Formation (Lamar Mem? ber), AMNH 347.] 8, Interior view of brachial valve, XI, USNM 154570d; 12, interior view of brachial valve, XI, USNM 154570e; 14, interior view of brachial valve, X2, USNM 154570f; 15, exterior view of brachial valve with concentric frills, X2, USNM 154570g; 20, exterior view of brachial valve with ornament, X2, USNM 154570h. [Bell Canyon Formation (Lamar Member), USNM 728p.] NUMBER 21 2567 PLATE 642.?Astegosia. 2 5 6 8 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 643 Martinia [All XI] Martinia miranda, new species: 1-4, Dorsal, ventral, side, and posterior views, juvenile para? type USNM 152382a; 35-39, dorsal, ventral, side, anterior, and posterior views, adult holotype USNM 152381a. [Cathedral Mountain Formation (lower), USNM 702a.] 5-8, Dorsal, side, anterior, and posterior views, juvenile paratype USNM 152387c. [Cathedral Mountain Formation (base), USNM 702 low.] 9-12, Dorsal, ventral, side, and posterior views, juvenile paratype USNM 152391. [Cathedral Mountain Formation (base), USNM 703b.] 13-17, Dorsal, anterior, side, ventral, and posterior views, young adult paratype USNM 152380. [Cathedral Mountain Formation (base), USNM 702.] 18-21, Dorsal, ventral, side, and posterior views, adult paratype USNM 152384r; 22, 23, exte? rior and interior views of elongate pedicle valve, paratype USNM 152383c; 24, 25, exterior and interior views of brachial valve, paratype USNM 152383e; 26, interior view of adult pedicle valve with pallial lines, paratype USNM 152383d; 27, 28, exterior and interior views of adult pedicle valve, paratype USNM 152383f; 29, 30, exterior and interior views pedicle valve, para? type USNM 152383a; 31, 32, exterior and interior views of brachial valve, paratype USNM 152383b; 33, 34, exterior and interior views of brachial valve, paratype USNM 152383g. [Cathe? dral Mountain Formation (base), USNM 702b.] NUMBER 21 2569 PLATE 643.?Martinia. 5 A * - ' 3 , A ^ I > A j - - ~ ~ 10 ' i , 17 1 ' \ 21 22 'ill \ 14 1 1 12 13 19 V ' 23 2572 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 645 Martinia [All hypotypes] Martinia rhomboidalis Girty: 1-2, Exterior and interior views, XI, juvenile pedicle valve, USNM 154554c; 3-4, exterior and interior views of pedicle valve, XI, USNM 154554d; 36-37, exterior and interior views of brachial valve with muscle marks, XI, USNM 154554c [Bell Canyon Formation (Lamar Member), USNM 725c] 5-6, Exterior and interior views of pedicle valve, XI, USNM 154556b; 13-14, exterior and interior views of pedicle valve, XI, USNM 154556c; 15-16, exterior and interior view of pedicle valve, XI, USNM 154556d; 17-18, exterior and interior views of thickened brachial valve, XI , USNM 154556e; 19-20, exterior and interior views of brachial valve, XI, USNM 154556f; 23-24, exterior and interior views of pedicle valve, XI, USNM 154556g; 29-30, exterior and interior views of brachial valve, XI, USNM 154556h; 31-32, exterior and interior views of brachial valve with borings internally healed, XI, USNM 154556i; 33-34, exterior and interior views of bra? chial valve, XI, USNM 154556J. [Bell Canyon Formation (Lamar Member), AMNH 347.] 7-8, Exterior and interior views of brachial valve, XI, USNM 152349q'; 9-10, exterior and interior views of pedicle valve with elongate tongue of sulcus, XI, USNM 152349v'; 25-26, exterior and interior views of pedicle valve, XI, USNM 152349s'; 27-28, exterior and interior views of brachial valve with borings that penetrate, some partly healed, XI, USNM 152349t. [Bell Canyon Formation (Lamar Member), USNM 738.] 11-12, Exterior and interior views of brachial valve with healed borings, XI, USNM 154555b; 21-22, exterior and interior views of pedicle valve with complex pallial system, XI, USNM 154555c; 35, interior views of pedicle valve, XI, USNM 154555d. [Bell Canyon Formation (Lamar Member), USNM 728p.] 38-39, Interior views of brachial valve with primary lamella, XI, X2, USNM 154557a. [Bell Canyon Formation (Lamar Member), AMNH 40.] NUMBER 21 2573 PLATE 645.?Martinia. 2574 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 646 Rallacosta and Heteraria Rallacosta species 1: 1-3, Dorsal, interior, and side views of brachial valve XI, USNM 153191b; 4-6, ventral, interior, and side views of pedicle valve, XI, USNM 153191a. [Cherry Canyon For? mation (Getaway Member), USNM 728.] Rallacosta species 2: 7-9, Ventral, interior, and side views of pedicle valve, XI, USNM 153192. [Bone Spring Formation, AMNH 629.] Heteraria blakemorei, new species: 10-13, Dorsal, interior, anterior, and side views of brachial valve, XI, paratype USNM 153190e; 14-17, ventral, posterior, interior and side views of pedicle valve, XI, paratype USNM 153190c; 18-22, dorsal, side, interior, and posterior views, XI, and interior view, X2, of brachial valve, paratype USNM 153190d; 23, exterior view of pedicle valve, XI, paratype USNM 153190f; 24-28, ventral, interior, anterior, and side views, XI, and interior view, X2, of pedicle valve, holotype USNM 153190a; 29-34, interior view, XI, X2, interior view tilted, X2, and dorsal, side, and anterior views, XI, of brachial valve, paratype USNM 153190b. [Cathedral Mountain Formation, USNM 721u.] NUMBER 21 2575 PLATE 646.?Rallacosta and Heteraria. to ^ v iff 10 . / 11 4* **'f -I % 2576 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 647 Rallacosta Rallacosta actina, new species: 1-5, Dorsal views, XI, X2, and side, posterior, and anterior views, XI, immature adult holotype USNM 152971d; 6-10, side, ventral, anterior, interior, and posterior views of abraded and bored pedicle valve, XI, paratype USNM 152971e; 11-15, dorsal, side, anterior, and posterior views, XI, and interior view, X2, of broken brachial valve, paratype USNM 152971c [Cathedral Mountain Formation, USNM 702.] 16-20, Interior, posterior, anterior, side, and ventral views of pedicle valve, XI, paratype USNM 152970m; 21-25, dorsal, side anterior, and posterior views, XI, and dorsal view, X2, of brachial valve, paratype USNM 152970k; 26-30, 37, side, posterior anterior, ventral, and interior views, XI, and ventral view, X2 (fig. 37) of pedicle valve, paratype USNM 152970-1; 34, exte? rior view of pedicle valve, X2, paratype USNM 152970n; 35, exterior view of brachial valve with circular boring, X2, paratype USNM 152970o; 36, exterior view of pedicle valve, X2, paratype USNM 152970p. [Cathedral Mountain Formation, USNM 702b.] 31-33, Exterior and interior views, X2, and interior view, XI, of brachial valve, paratype USNM 152972. [Cathedral Mountain Formation, USNM 702inst.] Rallacosta xystica, new species: 38-43, Exterior views, XI, X2, and interior, side, posterior, and anterior views, XI, of brachial valve with circular boring, paratype USNM 152976d; 44-49, interior, dorsal, anterior, posterior, and side views, XI, and dorsal view, X2, of brachial valve, holotype USNM 152976e; 50-54, ventral, interior, posterior, anterior, and side views, XI, of pedicle valve, paiatype USNM 152976g. [Cathedral Mountain Formation, USNM 703b.] NUMBER 21 2577 PLATE Ml.?Rallacosta. 2 5 7 8 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 648 Rallacosta Rallacosta imporcata, new species: 1-4, Dorsal, anterior, posterior, and side views, X1, of brachial valve, paratype USNM 152973w; 5-8, dorsal, anterior, posterior, and side views of brachial valve, XI, paratype USNM 152973x; 9-13, ventral, interior, anterior, side, and posterior views of pedicle valve, XI, paratype USNM 152973t; 14-19, exterior views, XI , X2, and interior, side, anterior, and posterior views, XI, of pedicle valve, holotype USNM 152973n; 20-25, exte? rior views, X2, XI, and posterior, anterior, side, and interior views, XI, of brachial valve, paratype USNM 152973j; 26-30, ventral, posterior, anterior, and side views, XI, and interior view (one side broken) X2, paratype USNM 152973v; 31-36, dorsal, side, anterior, and poste? rior views, XI, and exterior and interior views, X2, of brachial valve, paratype USNM 152973y; 37-42, ventral, anterior, posterior, and side views, XI, and exterior and interior views, X2, pedicle valve, paratype USNM 152973u; 43-48, dorsal, interior, anterior, posterior, and side views, XI, and dorsal view X2, of brachial valve, paratype USNM 152973q. [Bell Formation (Rader Member), USNM 725f.] Rallacosta laminata, new species: 49-52, Dorsal, side, anterior, and posterior views of brachial valve, XI, paratype USNM 152974u; 53-56, ventral, anterior, posterior, and side views of pedicle valve, XI, paratype USNM 152974y; 57-60, ventral, side, anterior, and posterior views of pedicle valve, XI, paratype USNM 152975b; 61-65, ventral, interior, side, posterior, and anterior views of pedicle valve, XI, paratype USNM 152975c; 66-70, doisal, interior, posterior, anterior, and side views of brachial valve, XI, paratype USNM 152975d; 71-75, dorsal, interior, side, anterior, and posterior views of brachial valve, XI, holotype USNM 152975g; 76-77, inte? rior views of brachial valve, X2, XI, paratype USNM 152975i. [Cathedral Mountain Forma? tion (base), USNM 708u.] NUMBER 21 2579 PLATE 648.?Rallacosta. 2580 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 649 Martinia, Neophricadothyris, Astegosia, and Composita [All XI] Martinia nealranchensis, new species: 1-4, Dorsal, ventral, anterior, and posterior views, juve? nile paratype USNM 154957a; 5-9, dorsal, ventral, side, anterior, and posterior views, young adult paratype USNM 154957b; 10-14, dorsal, ventral, side, posterior, and anterior views, adult holotype USNM 154957c [Neal Ranch Formation (bed 4), USNM 727c] Martinia wolfcampensis R. E. King: 15-19, Dorsal, ventral, posterior, side, and anterior views, holotype YPM 12295 (figured by R. E. King, 1931, pl. 40: fig. 9a-d). [Gaptank Formation (Uddenites-bearing Shale Member), R. E. King 88s.] Neophricadothyris bullata, new species: 20-24, Dorsal, ventral, anterior, side, and posterior views, paratype YPM 12370 (specimen figured by R. E. King, 1931, pl. 40: figs. 7a-c, under name Squamularia guadalupensis (Shumard). [Hess Formation, R. E. King 1.] Astegosia subquadrata (Girty): 25-26, Dorsal and side views of adult shell, hypotype USNM 154960. [Bell Canyon Formation (Lamar Member), USNM 728p.] Neophricadothyris cordata, new species: 27-30, Dorsal, side, posterior, and anterior views, adult paratype USNM 154959. [Cibolo Formation (Thin-bedded zone of Udden), USNM 738-1.] Martinia rhomboidalis Girty: 31-33, Dorsal, anterior, and side views of distorted juvenile shell, paratype USNM 154961a; 34-35, interior and exterior views of adult brachial valve para? type USNM 154961b; 36-37, interior and exterior views of large distorted pedicle valve, para? type USNM 154961-c. [Bell Canyon Formation (Lamar Member), USNM 728p.] Composita strongyle, new species: 38-40, Dorsal, side, and anterior views of adult specimen with cemented Derbyia, paratype USNM 154962a; 41-43, anterior, dorsal, and side views of adult shell with bryozoan overgrowths, paratype USNM 154962b. [Neal Ranch Formation (bed 4), USNM 727c] NUMBER 21 2581 PLATE 649.?Martinia, Neophricadothyris, Astegosia, and Composita. < ^ * il, 12 X 20 21 23 24 < * \ ? V 27 30 31 ?~ 32 A. 33 34 38 "nr 43 2582 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 650 Cleiothyridina Cleiothyridina ciriacksi, new species: 1-5, Anterior, ventral, side, posterior, and dorsal views of a complete specimen, XI, paratype USNM 154386g; 6-10, side, ventral, posterior, dorsal, and anterior views, XI, holotype USNM 154386h; 11-13, side, dorsal, and anterior views, X2, of the holotype; 14, anterior portion of the holotype, X4, showing the spines; 15, 16, interior and exterior tilted to show the dental plates of a pedicle valve, Xl.5, paratype USNM 154386k; 17, 18, interior of two brachial valves, Xl.5, X3, paratypes USNM 154386J, i. [Park City Forma? tion (Franson Member), USNM 763.] Cleiothyridina mulsa, new species: 19, Ventral, posterior, side, anterior, and dorsal views of a complete specimen, XI, paratype USNM 152459h; 20-24, ventral, dorsal, anterior, posterior, and side views, X2, of the preceding paratype; 25, ventral, posterior, side, anterior, and dorsal views, XI, holotype USNM 152459i; 26-30, side, dorsal, anterior, posterior, and ventral views, X2, holotype; 31, brachial valve of the holotype, X3, tilted to show the ornament; 32, 33, inte? rior and tilted views of the pedicle valve, X3, showing dental plates, paratype USNM 152459-1; 34, 35, interior and tilted views of the brachial valve interior, X3, showing the hinge plate, paratype USNM 152459k. [Skinner Ranch Formation (base), USNM 705a.] Cleiothyridina nana, new species: 36-41, Dorsal view, XI, and anterior, posterior, side, dorsal and ventral views, X4, holotype USNM 154387a; 42-47, dorsal view, XI, and ventral, dorsal, anterior, posterior, and side views, X2, paratype USNM 154387b. [Road Canyon Formation, USNM 710u.] 48, Interior of the brachial valve, X4, showing the hinge plate, paratype USNM 152456a; 49, exterior of the brachial valve, X6, showing the ornament, paratype USNM 152456b. [Road Canyon Formation, USNM 709c] 84-88, Dorsal, posterior, side, anterior, and ventral views, X4, paratype USNM 154390a; 89- 93, posterior, dorsal, anterior, side, and ventral views of another complete specimen, X4, para? type USNM 154390b; 94, interior of the brachial valve, X4, showing the hinge plate, paratype USNM 154390c; 95-99, dorsal, posterior, side, anterior, and ventral views of a complete speci? men, X4, holotype USNM 154390d. [Road Canyon Formation, USNM 722f.] Cleiothyridina pilularis, new species: 50, Anterior, posterior, side, ventral, and dorsal views of a complete specimen devoid of spines, XI, paratype USNM 152461d; 51-55, anterior, poste? rior, side, dorsal, and ventral views of a specimen preserving some of its spines, X2, paratype USNM 152461 v; 56-63, side, anterior, and dorsal views, X2, and posterior, ventral, side, dorsal, and anterior views, X2, and posterior, ventral, side, dorsal, and anterior views, XI, holotype USNM 152461q; 81, 82, interior of the pedicle valve tilted and interior view, Xl.5, paratype USNM 152461u; 83, interior of the brachial valve, X2, showing hinge plate and pallial marks, paratype USNM 152461s. [Bell Canyon Formation (Lamar Member), USNM 738b.] 64-71, Ventral, posterior, anterior, side, and dorsal views, XI, and anterior, side, and dorsal views, X2, of a complete specimen devoid of spines, paratype USNM 154388a; 80, interior of a brachial valve, X2, showing the hinge plate and pallial marks, paratype USNM 154388b. [Bell Canyon Formation (Lamar Member), USNM 725c] 72-76, Anterior, side, posterior, dorsal, and ventral views of a specimen preserving some of its spines, X2, paratype USNM 154389a; 77-79, anterior, side, and dorsal views of another specimen with spines, X2, paratype USNM 154389b. [Bell Canyon Formation (Lamar Member), AMNH 40.] NUMBER 21 2583 PLATE 650.?Cleiothyridina. 2584 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 651 Cleiothyridina and Nucleospira Cleiothyridina rectimarginata, new species: 1-6, Anterior, posterior, side, ventral, and dorsal views, XI, and posterior, ventral, side, anterior, and dorsal views, X2, paratype USNM 152467a. [Neal Ranch Formation (beds 12-14 of P. B. King), USNM 701d.] 7, 8, Side and dorsal views of a complete specimen, X2, paratype USNM 154391a; 9-13, ante? rior, side, posterior, ventral, and dorsal views of a complete specimen preserving some of its spines, X2, paratype USNM 152471-1; 14-18, anterior, posterior, side ventral, and dorsal views of a complete specimen with some spines, X2, holotype USNM 152471o; 19, 20, interior and tilted views of a pedicle valve, X2, paratype USNM 154391c; 21, 22, tilted and interior views of a brachial valve, X4, showing the hinge plate, paratype USNM 154391d; 23, partial side view of a complete individual broken to show the spire, X4, paratype USNM 154391b. [Neal Ranch Formation (beds 12-14 of P. B. King), USNM 701k.] 24, 25, Interior of two brachial valves, X2, showing the hinge plate, paratypes USNM 154392a, b; 26-30, anterior, side, posterior, ventral, and dorsal views of a stout specimen, X2, paratype USNM 152469n; 31-36, posterior, anterior, side, ventral, and dorsal views, X2, and dorsal view, XI, of another strongly convex specimen, paratype USNM 152469k; 37-42, dorsal view, XI, and posterior, anterior, side, ventral, and dorsal views, X2, of complete individual with spines, paratype USNM 152469j; 43, exterior of a brachial valve preserving some of its spines, X3, paratype USNM 154392c; 44, dorsal view of a complete specimen preserving some of its spines, X3, paratype USNM 154392d. [Neal Ranch Formation (beds 12-14 of P. B. King), USNM 70Ih.] Nucleospira cunctata, new species: 45-50, Ventral, posterior, side, anterior, and dorsal views, XI , and anterior, posterior, side, dorsal, and ventral views, X4, holotype USNM 152453z; 51-56, ventral, posterior, side, anterior, and dorsal views, XI, and anterior, posterior, side, dorsal and ventral views, X4, of a complete specimen, paratype USNM 152453g'; 57, ventral, posterior, side, anterior, and dorsal views of a complete specimen, XI, paratype USNM 152453h'; 58, interior of a brachial valve, X6, showing the anterior side of the cardinal process, paratype USNM 154393a; 59, posterior of the preceding specimen, X4, showing the posterior side of the cardi? nal process; 60, 61, interior of a pedicle valve, X4, and the same interior tilted to show the median septum and dental plates, X6, paratype USNM 154393b; 62, 63, side and oblique side views, X6, showing the jugum of the spire, paratype USNM 154393c; 64-66, tilted, side, oblique, and side views of another complete specimen, X6, showing the spire, paratype USNM 154393d; 67, tilted interior of a brachial valve, X4, showing the cardinal process, paratype USNM 154393e; 68, 69, interior of two pedicle valves, X4, showing the apical plate, paratype USNM 155118a, b; 70, posterior of a brachial valve, X4, showing the cardinal process, paratype USNM 154393f; 71, interior of a brachial valve in anterior oblique view, X6, showing the jugum of the spire, paratype USNM 154393g; 72, brachial valve tilted posteriorly to show the interior side of the cardinal process, X6, paratype USNM 154393h. [Cathedral Mountain Formation (base), USNM 708u.] Cleiothyridina species undetermined: 73-77, Anterior, posterior, ventral, side, and dorsal views of a complete specimen with spines, X2, figured specimen USNM 154394. [Hueco Canyon Formation, USNM 499b = 725z.] NUMBER 21 2585 PLATE 651.?Cleiothyridina and Nucleospira. W*f W''r< 2 5 8 6 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 652 Composita [All XI] Composita affinis Girty [all hypotypes]: 1-4, Ventral, side, anterior, and posterior views of small juvenile shell, USNM 153002a; 5-8, ventral, side, posterior, and anterior views of juvenile shell, USNM 153002b; 9-12, ventral, side, posterior, and anterior views of juvenile shell, USNM 153002c; 13-16, ventral, side, anterior, and posterior views of juvenile shell, USNM 153002d; 17-21, ventral, dorsal, side, posterior, and anterior views of adult shell, USNM 153002e; 22-23, exterior and interior views of pedicle valve, USNM 153002f; 24-28, ventral, dorsal, side, poste? rior, and anterior views of adult shell, USNM 153002g; 29-30, exterior and interior views of brachial valve, USNM 153002h; 31-32,. exterior and interior views of pedicle valve with dis? tinct muscle, pallial, and genital markings, USNM I53002i; 33-37, ventral, dorsal, side, poste? rior, and anterior views of adult shell, USNM 153002]; 38-39, exterior and interior views of brachial valve, USNM 153002k; 40-44, ventral, dorsal side, posterior, and anterior views of adult shell, USNM 153002m. [Bell Canyon Formation (Lamar Member), USNM 738.] Composita apheles, new species: 45-49, Ventral, dorsal, side, posterior, and anterior views, juvenile paratype USNM 154537a; 50-54, ventral, dorsal, side, posterior, and anterior views, juvenile paratype USNM 154537b; 55-59, ventral, dorsal, side, anterior, and posterior views, juvenile paratype USNM 154537c; 60-64, ventral, dorsal, side, anterior, and posterior views, juvenile paratype USNM 154537d; 69-73, ventral, dorsal, side, posterior, and anterior views, young adult paratype USNM 154537e; 74-78, ventral, dorsal, side, posterior, and anterior views, adult holotype USNM 154537f; 88, ventral view of shell broken to show spire, paratype USNM 154537g. [Skinner Ranch Formation (Decie Ranch Member), USNM 720c] 65-68, Ventral, side, posterior, and anterior views, young adult paratype USNM 153003a; 84- 87, ventral, side, anterior, and posterior views, adult paratype USNM 153003b. [Skinner Ranch Formation (Decie Ranch Member), USNM 705a.] 79-83, Ventral, dorsal, side, posterior, and anterior views of large and somewhat crushed adult, paratype USNM 154536a. [Skinner Ranch Formation (Decie Ranch Member), USNM 727u.] NUMBER 21 2587 PLATE 652.?Composita. 2588 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 653 Composita Composita costata, new species: 1-4, Ventral and dorsal views, XI, X2, adult holotype USNM 153006a; 5-7, interior views, XI, X2, and exterior view, X2, of pedicle valve, paratype USNM 153006b; 8-10, interior views, XI, X2, and exterior view, X2, of brachial valve, paratype USNM 153006c [Bone Spring Formation, USNM 725y.] Composita apsidata, new species: 11-15, Ventral, dorsal, side, posterior, and anterior views, XI, juvenile paratype USNM 153004a; 16-20, ventral, dorsal, side, anterior, and posterior views, XI, juvenile paratype USNM 153004b; 21-25, ventral, dorsal, side, anterior, and posterior views, XI , adult paratype USNM 153004c; 26-30, ventral, dorsal, side, anterior, and posterior views, XI , adult holotype USNM 153004d; 31-35, ventral, dorsal, side, anterior, and posterior views, XI, adult paratype USNM 153004e; 36, dorsal view of shell broken to show spiralium (rotated to longitudinal position), XI, paratype USNM 153004f; 37, ventrolateral view of shell broken to reveal part of spire held by siliceous partition in geopetal position, XI, paratype USNM 153004g. [Hess Formation (Taylor Ranch Member), USNM 702c] Composita cracens, new species: 38-39, Exterior and interior views of pedicle valve, XI, para? type USNM 153007g'; 40-41, exterior and interior views of pedicle valve with very deep muscle marks, XI, paratype USNM 153007h'; 42-43, exterior and interior views of pedicle valve, XI , paratype USNM 153007i'; 44-45, exterior and interior views of brachial valve, XI, paratype USNM 153007J'; 46-47, exterior and interior views of brachial valve, XI, paratype USNM 153007k'. [Bone Spring Formation, USNM 728f.] 48-52, Ventral, dorsal, side, posterior, and anterior views of adult shell, XI, holotype USNM 153008a. [Bone Spring Formation, USNM 728c] NUMBER 21 2589 PLATE 653.?Composita. * * \0* 10 11 12 1 3 14 15 ( V . 21 ? i 2 2 V, ( 24 23 16 / ? . ; ' ? 17 18 ""& 19 20 26 29 28 X r ? ? ^Jito 36 37 38 -T * i j " ^ 39 L r . . . ?**" 42 44 ? 46 ia - &f s^, ,"--*"' 48 %^rmS0 - ^ ^ r ' 49 '^ i a 50 45 - 47 51 52 2590 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 654 Composita Composita bucculenta, new species: 1-7, Ventral, dorsal, side, and posterior views, X2, and dorsal, side, and anterior views, XI, juvenile paratype USNM 153005a; 8-14, ventral, dorsal, side, and posterior views, X2, and dorsal, side, and anterior views, XI, young adult paratype USNM 153005b; 21-23, interior view, X2, and exterior view, XI, of pedicle valve, paratype USNM 153005c; 24-30, ventral, dorsal, side, and posterior views, X2, and dorsal, side, and anterior views, XI, adult paratype USNM 153005d; 31-37, ventral, dorsal, side, and posterior views, X2, and dorsal, side, and anterior views, XI , adult holotype USNM 153005e; 42-44, exterior view, XI, and interior views, XI, X2, of brachial valve, paratype USNM 153005L [Cathedral Mountain Formation (base), USNM 702ent.] 15-20, Ventral, anterior, and side views, X2, and dorsal, side, and posterior views, XI, adult paratype USNM 154548a; 38-39, interior views, XI, X2, of pedicle valve, paratype USNM 154548b; 40-41, interior views, XI, X2, of brachial valve, paratype USNM 154548c; 45-50, ventral, side, and interior views, X2, and dorsal, side, and posterior views, XI, adult para? type USNM 154548d; 51-56, ventral, side, and anterior views, X2, and dorsal, side, and pos? terior views, XI, adult paratype USNM 154548e; 57-62, ventral, side, and anterior views, X2, and dorsal, side, and posterior views, XI, adult paratype USNM 154548f; 63-68, ventral, side, and anterior views, X2, and dorsal, side, and posterior views, XI, adult paratype USNM 154548g. [Hess Formation, USNM 726n.] Composita strongyle, new species: 69-73, Ventral, dorsal, side, anterior, and posterior views, XI, juvenile paratype USNM 153038a; 74-78, ventral, dorsal, side, anterior, and posterior views, XI, adult paratype USNM 153038b. [Neal Ranch Formation (bed 12 of P. B. King), USNM 701k.] 79-83, Dorsal, ventral, posterior, anterior, and side views, XI, adult holotype USNM 153040a. [Neal Ranch Formation (beds 9-12 of P. B. King), USNM 701c] 84-88, Ventral, dorsal, posterior, anterior, and side views, XI, young adult paratype USNM 153041a. [Neal Ranch Formation, USNM 701.] NUMBER 21 2591 PLATE 654.?Composita. 2 5 9 2 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 655 Composita [All XI] Composita crassa, new species: 1-5, Ventral, dorsal, side, posterior, and anterior views, juvenile paratype USNM 153009a; 6-10, ventral, dorsal, side, posterior, and anterior views, juvenile para? type USNM 153009b; 11-15, ventral, dorsal, side, posterior, and anterior views, juvenile paratype USNM 153009c; 16-20, ventral, dorsal, side, posterior, and anterior views, young adult paratype USNM 153009d; 21-25, ventral, dorsal, side, posterior, and anterior views, adult paratype USNM 153009e; 26-30, ventral, dorsal, side, anterior, and posterior views, adult paratype USNM 153009f; 31-35, ventral, dorsal, side, posterior, and anterior views, adult holotype USNM 153009g; 36-37, interior and exterior views of brachial valve with hinge plate and cardinal process, paratype USNM 153009h; 38-39, interior and exterior views of brachial valve, showing end of cardinal process, paratype USNM 153009i. [Road Canyon Formation, USNM 719x.] Composita emarginata Girty: 40-44, Ventral, dorsal, side, posterior, and anterior views of some? what exfoliated shell, hypotype USNM 154545a; 47-51, ventral, dorsal, side, posterior, and anterior views of partly exfoliated shell, hypotype USNM 154545b. [Bell Canyon Formation (Lamar Member), USNM 738b.] 45-46, Exterior and interior views of brachial valve, hypotype USNM 154546a. [Bell Canyon Formation (Pinery Member), AMNH 537.] NUMBER 21 2593 PLATE 655.?Composita. jh* v. i ?\Jr' 1 40 * % bfi^v 41 a ? at , 43 y"VV i^ Tv 45 46 '-?it . 47 1 ? SnAjT B ? ( 48 49 -J A i> 50 -<*..*?*>, 12&B. 51 2 5 9 4 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 656 Composita [All XI] Composita discina, new species: 1-5, Ventral, dorsal, side, posterior, and anterior views, young adult paratype USNM 153010a; 6-10, ventral, dorsal, side, posterior, and anterior views, young adult paratype USNM 153010b; 11-15, ventral, dorsal, side, posterior, and anterior views, adult paratype USNM 153010c [Skinner Ranch Formation, USNM 714p.] 16-20, Ventral, dorsal, side, posterior, and anterior views, adult holotype USNM 153013a. [Skinner Ranch Formation (base), USNM 708q.] Composita enormis, new species: 21-25, Ventral, dorsal, posterior, side, and anterior views, juve? nile paratype USNM 153020a; 26-30, ventral, dorsal, side, posterior, and anterior views, elon? gate juvenile paratype USNM 153020b; 31-35, ventral, dorsal, side, posterior, and anterior views, adult paratype USNM 153020c; 36-40, ventral, dorsal, side, posterior, and anterior views, adult holotype USNM 153020d; 43-47, ventral, dorsal, side, posterior, and anterior views, adult paratype USNM 153020e; 50-51, exterior and interior views of pedicle valve with pallial mark? ings, paratype USNM 153020L [Word Formation (lens between Willis Ranch and Appel Ranch members), USNM 706b.] 41-42, Ventral and dorsal views of crushed large shell, paratype USNM 154538a. [Word For? mation (Appel Ranch Member), USNM 727].] 48-49, Exterior and interior views of large brachial valve, paratype USNM 153021a. [Word Formation (Willis Ranch Member), USNM 706a.] NUMBER 21 2595 PLATE 656.?Composita. $ 2 3 V $k 12 15 14 10 ^% 17 4:.y& ?y 20 ? ^ # i . 2596 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 657 Composita Composita pilula, new species: 1-5, Ventral, dorsal, side, posterior, and anterior views, XI, juve? nile paratype USNM 153027t; 6-10, ventral, dorsal, side, posterior, and anterior views, XI, young adult paratype USNM 153027u; 11-15, ventral, dorsal, side, posterior, and anterior views, XI, young adult paratype USNM 153027z; 38-39, exterior view, XI and interior view, X2, of bra? chial valve with hinge plate and cardinal process, paratype USNM 153027c'. [Road Canyon Formation, USNM 720d.] 16-20, Ventral, dorsal, side, posterior, and anterior views, XI, young adult paratype USNM 154539a; 21-25, ventral, dorsal, side, posterior, and anterior views, XI, adult paratype USNM 154539b; 26-30, ventral, dorsal, side, posterior, and anterior views, X 1, adult paratype USNM 154539c; 31-35, ventral, dorsal, side, posterior, and anterior views, XI, adult holotype USNM 154539d; 36-37, exterior and interior views of brachial valve, XI, paratype USNM 154539c [Road Canyon Formation, USNM 724].] Composita mexicana (Hall) [all hypotypes]: 40-46, Ventral, dorsal, side, anterior, and posterior views, X2, and dorsal and side views, XI, of young adult shell, USNM 154540a; 47-53, ventral, dorsal, side, posterior, and anterior views, X2, and dorsal and side views, XI, of adult shell, USNM 154540b; 54-59, ventral, dorsal, side, and anterior views, X2, and dorsal and side views, XI, of cracked shell, USNM 154540c; 60-62, exterior views, X2, XI, and interior view, X2, of pedicle valve, USNM 154540d; 63-69, ventral, dorsal, side, posterior, and anterior views, X2, and dorsal and side views, XI, of adult shell, USNM 154540e; 70-72, exterior views, X2, XI, and interior view, X2, of brachial valve with small bore hole, USNM 154540f; 73-75, exterior views, X2, XI, and interior view, X2, of pedicle valve, USNM 154540g; 76-78, exterior views, X2, XI, and interior view, X2, of pedicle valve, USNM 154540h; 79-81, exterior views, X2, XI, and interior view, X2, of brachial valve, USNM 154540L [Hueco Formation, USNM 725a.] NUMBER 21 2597 PLATE 657.?Composita. 2 3 4 21 22 ^0 ^ n 23 24 25 7 8 9 10 X& 4a> 11 12 13 14 26 27 ^ 2 8 29 30 16 1 i & F 1 7 ^ 1 8 19 2598 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 658 Composita Composita imbricata, new species: 1-5, Ventral, dorsal, side, posterior, and anterior views, XI, juvenile paratype USNM 153023a; 6-10, ventral, dorsal, side, posterior, and anterior views, XI, juvenile paratype USNM 153023b; 11-15, ventral, dorsal, side, posterior, and anterior views, XI, young adult paratype USNM 153023c; 16-20, ventral, dorsal, side, posterior, and anterior views, XI, adult paratype USNM 153023d; 21-25, ventral, dorsal, side, posterior, and anterior views, X1, adult paratype USNM 153023e; 32-36, ventral, dorsal, side, posterior (pedicle valve up), and anterior views, XI, adult holotype USNM 153023f. [Cathedral Mountain Formation, USNM 702.] 26-30, Ventral, dorsal, side, posterior, and anterior views, XI, adult paratype USNM 154541a. [Cathedral Mountain Formation (base), USNM 702un.] 31, Exterior view of brachial valve with color marks, XI, paratype USNM 154542a. [Cathe? dral Mountain Formation (lower), USNM 721u.] Composita nucella, new species: 37-43, Ventral, dorsal, side, posterior, and anterior views, X2, and dorsal and side views, XI, juvenile paratype USNM 153024a; 44-50, ventral, dorsal, side, posterior, and anterior views, X2, and dorsal and side views, XI, young adult paratype USNM 153024b; 51-57, ventral, dorsal, side, posterior, and anterior views, X2, and dorsal and side views, XI, adult holotype USNM 153024c; 58-62, ventral, dorsal, side, posterior, and anterior views, XI, adult paratype USNM 153024c!; 63-69, ventral, dorsal, side, posterior, and anterior views, XI, X2, adult paratype USNM 153024e; 70, side view of primary lamella and part of jugum, X2, paratype USNM 153024f. [Bone Spring Formation (Cutoff Member), AMNH 678.] NUMBER 21 2599 PLATE 658.?Composita. 2600 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 659 Composita Composita parasulcata, new species: 1-5, Ventral, dorsal, side, posterior, and anterior views, XI, juvenile paratype USNM 153025r; 6-10, ventral, dorsal, side, posterior-, and anterior views, XI, juvenile paratype USNM 153025y; 11-15, ventral, dorsal, side, posterior, and anterior views, XI, young adult paratype USNM 153025d'; 16-20, ventral, dorsal, side, posterior, and anterior views, XI, young adult paratype USNM 153025e'; 21-25, ventral, dorsal, side, posterior, and anterior views, XI, adult paratype USNM 153025]'; 33, ventral view of shell broken to show spiralium, X2, paratype USNM 153025f. [Word Formation (Willis Ranch Member), USNM 706c] 26-32, Ventral, dorsal, side, posterior, and anterior views, X2, and dorsal and side views XI, paratype USNM 153026a; 45-51, ventral, dorsal, side, posterior, and anterior views, X2, and dorsal and side views, XI, adult paratype USNM 153026b. [Word Formation (China Tank Member), USNM 706c] 34, 35, Exterior view, XI, and interior view, X2, of pedicle valve, paratype USNM 154543a; 36-37, exterior view, XI, and interior view, X2, of pedicle valve, paratype USNM 154543b; 38-44, ventral, dorsal, side, posterior, and anterior views, X2, and dorsal and side views, XI, adult paratype USNM 154543c; 52-53, exterior view, XI, and interior view, X2, of brachial valve, paratype USNM 154543d; 54-60, ventral, dorsal, side, posterior, and anterior views, X2, and dorsal and side views, XI, adult holotype USNM I54543e; 61-62, interior view, X2, and exterior view, XI, of brachial valve, paratype USNM 154543f; 63-69, ventral, dorsal, side, pos? terior, and anterior views, X2, and dorsal and side views, XI, adult paratype USNM 154543g. [Word Formation (lens between Willis Ranch and Appel Ranch members), USNM 706b.] NUMBER 21 2601 PLATE 659.?Composita. 2 6 0 2 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 660 Composita Composita pyriformis, new species: 1-6, Dorsal, side, posterior, and anterior views, X2, and ven? tral and side views, XI, adult paratype USNM 153030w; 26-31, dorsal, side, posterior, and anterior views, X2, and ventral and side views, XI, adult holotype USNM 153030x. [Bell Can? yon Formation (Pinery Member), USNM 731.] 7-13, Ventral, dorsal, posterior, and side views, X2, and dorsal, side, and anterior views, XI, adult paratype USNM 153031a; 14-19, ventral, dorsal, and side views, X2, and dorsal, side and anterior views, XI, adult paratype USNM 153031b; 20-25, ventral, dorsal, and side views, X2, and dorsal, side, and anterior views, XI, adult paratype USNM 153031c [Bell Canyon Forma? tion (Pinery Member), USNM 725h.] Composita prospera, new species: 32-36, Ventral, dorsal, side, posterior, and anterior views, XI, young adult paratype USNM 153028t; 37-41, ventral, dorsal, side, anterior, and posterior views, XI, adult paratype USNM 153028w; 42-46, ventral, dorsal, side, anterior, and posterior views, XI, adult holotype USNM 153028x; 47-48, exterior and interior views of large brachial valve showing muscle marks, XI, paratype USNM 153028f'; 49-50, exterior and interior views of large pedicle valve with distinct muscle marks, XI, paratype USNM 153028g'. [Cherry Canyon For? mation (Getaway Member), USNM 728.] NUMBER 21 2603 PLATE 660.?Composita. 2 6 0 4 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 661 Composita Composita quantilla, new species: 1-7, Ventral and dorsal views, XI, X2, and side, posterior, and anterior views, X2, adult paratype USNM 153034v; 8-14, ventral and dorsal views, XI, X2, and side, posterior, and anterior views, X2, adult holotype USNM 153034z; 15-21, ventral and dorsal views, XI, X2, and side, posterior, and anterior views, X2, adult paratype USNM 153034y. [Road Canyon Formation, USNM 721x.] Composita stalagmium, new species: 22-26, Ventral, dorsal, side, posterior, and anterior views, XI, young adult paratype USNM 154544a; 29-33, ventral, dorsal, side, posterior, and anterior views, XI, elongate adult paratype USNM 154544b; 36-40, ventral, dorsal, side, posterior, and anterior views, XI, adult paratype USNM 154544c; 41-45, ventral, dorsal, side, posterior, and anterior views, XI, adult paratype USNM 154544d; 46-50, ventral, dorsal, side, posterior, and anterior views, XI, adult paratype USNM 154544c [Road Canyon Formation, USNM 719x.] 27-28, Dorsal and side oblique views of broken shell with silicified spiralium, XI, paratype USNM 153035a; 34, side view of broken shell with displaced jugum, XI, paratype USNM 153035b; 35, dorsal view of broken shell with spiralium nearly intact, XI, but rotated to longi? tudinal axis, paratype USNM 153035c [Road Canyon Formation, USNM 702c] 51-52, Side and dorsolateral views of broken shall with jugum and part of spiralium intact, X2, paratype USNM 154547. [Road Canyon Formation, USNM 726z.] NUMBER 21 2605 PLATE 661.?Composita. 2 6 0 6 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY PLATE 662 Composita [ Figures 1-35 wide, specimens, 36-65 narrow; all X1] Composita stalagmium, new species: 1-5, Ventral, dorsal, side, posterior, and anterior views, juvenile paratype USNM 153035d; 6-10, ventral, dorsal, side, posterior, and anterior views, juvenile paratype USNM 153035e; 11-15, ventral, dorsal, side, posterior, and anterior views, juvenile paratype USNM 153035f; 16-20, ventral, dorsal, side, posterior, and anterior views, young adult paratype USNM 153035g; 21-25, ventral, dorsal, side, posterior, and anterior views, adult paratype USNM 153035h; 26-30, ventral, dorsal, side, posterior, and anterior views, adult paratype USNM 153035i; 31-35, ventral, dorsal, side, posterior, and anterior views, adult holo? type USNM 153035J; 36-40, Ventral, dorsal, side, posterior, and anterior views, juvenile paratype USNM 153036a; 41-45, ventral, dorsal, side, posterior, and anterior views, juvenile paratype USNM 153036b; 46-50, ventral, dorsal, side, anterior, and posterior views, young adult paratype USNM 153036c; 51-55, ventral, dorsal, side, anterior, and posterior views, adult paratype USNM 153036d; 56-60, ventral, dorsal, side, anterior, and posterior views, young adult paratype USNM 153036e; 61-65, ventral, dorsal, side, posterior, and anterior views, large adult paratype USNM 153036L [Road Canyon Formation, USNM 702c] NUMBER 21 2607 PLATE 662.?Composita. ft U.S. GOVERNMENT PRINTING OFFICE: I97S 5 4 6 - 3 7 4 / 1 VOLUME 2 OF 2 Publication in Smithsonian Contributions to Paleobiology Manuscripts for serial publications are accepted by the Smithsonian Institution Press, sub? ject to substantive review, only through departments of the various Smithsonian museums. 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