PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM issued Sfj&Sfv yL G?|ot by & SMITHSONIAN INSTITUTIONU S NATIONAL MUSEUM Vol. 93 Washington: 1943 No. 3161NEW MARINE MOLLUSKS FROM THEANTILLEAN REGION By Harald A. Rehder In the course of identifying specimens sent in by correspondentsof the United States National Museum, I have from time to timerecognized forms that could not be assigned to any known species.While making these identifications I have also run across noveltiesin our collection that seem important enough to warrant theirdescription at the present time.Sincere thanks are due Dr. Paul Bartsch for his ever-ready assist-ance and to the following assiduous collectors whose interest andpatience have made this paper possible: Dr. B. R. Bales, of Circle-ville, Ohio; Dr. T. Van Hyning, of Gainesville, Fla.; Maxwell Smith,of Lantana, Fla. ; and Ted Bayer, of Gainesville, Fla.Genus COOPERELLA Carpenter, 1864COOPERELLA ATLANTICA, new speciesPlate 19, Figures 3-4Shell small, thin, inflated, broadly oval, ends bluntly rounded,translucent whitish, smooth except for growth ridges; beaks slightlyanterior and prosogyrate. In the left valve there are three thindivergent cardinal teeth, the central one bifid, while in the right valvethere are two thin divergent cardinals ; no laterals are present. Liga-ment external, rather short and broad, posterior to the umbones.Pallial sinus rather broad and reaching beyond the center of theshell. 187491729?42 188 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 93T] e type, U.S.N.M. No. 517058, was dredged off Peanut Island,northern Lake Worth, Fla., by Ted Bayer. It measures: Length,G.5 mm. : height, 4.8 mm.This, the second known species of Oooperella, extends the range ofthe genus into the Antillean region. It differs from the type, O.suhdiaphana Carpenter of the west coast, by being smaller, moretranslucent, and more equilateral.Genus PITAR Romer, 1857Nanopitar, new subgenusShell small, suborbicular, externally smooth. Left posterior car-dinal thin, high, joined in part to the ligamental nymph, lower partfree, curving awa}? and almost reaching end of hinge plate; leftmiddle and anterior cardinals united at top. The right cardinalseparate, the middle cardinal rather stout, parallel to the anteriorone, posterior cardinal strong, bifid. Pallial sinus moderately deep,rounded. Ventral margin smooth.Genotype: Pitar (Nanopitar) p/'li/Ja, new species.This subgenus differs from the other subgenera of Pitar in beingsmaller and more rounded and in being smooth externally. In thecharacters of the hinge and pallial sinus it is close to CalpitariaJukes-Browne and Tinctora Jukes-Browne; from the latter it differsin having a smooth internal ventral margin. From Calpitaria itdiffers in having a smooth external surface and in being moreorbicular. PITAR (NANOPITAR) PILULA, new speciesPlate 19, Figttkes 5-10Shell small, suborbicular, umbones subcentral, rather prominent,prosogyrate, external surface smooth, covered with a thin yellow-brown, deciduous periostracum. An incised line outlines the other-wise undifferentiated broad lunule. Ligament attached to anelongate sunken nymph. In the left valve the posterior cardinal isfor (lie most part confluent with nymph, separating near the lowerend and almost reaching the edge of the. hinge plate; median toothslightly broader than the anterior cardinal and joined to it at rightangles under the umbo; anterior lateral strong, erect. In rightvalve the upper anterior lateral is slightly smaller than the lower(Hit. from which it is separated by a pit, which is connected with thefirst cardinal interspace by a narrow channel at the base of the an-terior cardinal; cardinals all separate. Anterior cardinal short, thin,parallel to the slightly broader median cardinal; posterior cardinalelongate, rather broad, bifid. Pallial sinus moderately deep, rounded.Internal ventral margin smooth. NEW ANTILLEAN MOLLUSKS?EEHDER 189The type, U.S.N.M. No. 517057, measures : Height, 5.9 mm. ; length,(5 mm., breadth, 4.2 mm. It was collected by Ted Bayer in LakeWorth, Fla. Genus ERVILIA Turton, 1822ERVILIA ROSTRATULA, new speciesPlate 19, Figures 1-2Shell small, stout, subtrigonal, rather inflated, white or yellowish,posterior end slightly rostrate, sculpture consisting of strong con-centric riblets, crossed posteriorly by fine radial lines. Hinge typi-cally erviliid.The type, U.S.N.M. No. 517059, was collected with several othersby Ted Bayer in Lake Worth. It measures : Length, 4.5 mm. ; height,3.3 mm., breadth, 2.3 mm.This species is closest to the Bermudian subcancellata E. A. Smith,differing in being more inflated, more trigonal, and posteriorly ros-trate and having the radial sculpture restricted more to the posteriorend. Genus ASTHENOTHAERUS Carpenter, 18G4ASTHENOTHAERUS BALESI, new speciesPlate 19, Figures 13-14Shell ovate, thin, grayish white, anterior end rounded, posteriorend slightly narrower and truncated, with a ridge running from themedian, opisthogyrate umbo to the posteroventral angle. The earlyportion of the shell is sharply biangulate and evenly concentricallyribbed; in the later portion the concentric ridges become irregularfolds, giving the shell a slightly rugose appearance. An elongatecalcareous lithodesma, broadly angled in the middle, lies under theumbones in a spongy cartilage. Pallial sinus moderately deep.The type, U.S.N.M. No. 536052, measures : Length, 10.5 mm., height,7.6 mm. It was found by Dr. B. R. Bales on Missouri Key, Fla.This species differs from the only other known West Atlanticspecies, A. hemphffli Dall, in having a more elongate-ovate shapeand more central umbones.Genus POROMYA Forbes, 1844POROMYA ROSTRATA, new speciesPlate 19, Figuiu s ! L-12Shell small, inflated, slightly inequivalve, right valve slightlylarger and deeper with a more prominent umbo; broadly and ir-regularly ovate in shape, posteriorly rostrate, the left valve beingmore rostrate than the right; umbones central. External surface 190 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 93densely and coarsely granulate, the granules apparently arranged mradial lines. Internally the right valve has a strong cardinal tooththat fits into a socket in the hinge of the left valve, and there is arather stout internal ligament posterior to the tooth. The ventralmargin is radially furrowed in the right valve, smooth in the left;the pallial line is simple.The type, U.S.N.M. No. 536152, measures: Length. 7.3 mm.; height,6.4 mm.; breadth, 5 mm. It was dredged in TO fathoms off Del rayBeach, Palm Beach County, Fla.This differs from Poromya gra/rwlata Nyst and the other WestAtlantic Poromyas in its rostrate form and larger, more crowdedgranules. It occurs from Cape Hatteras, N. C, to Barbados.Genus CAECUM Fleming, 1813CAECUM (CAECUM) CAYOSENSE, new speciesPlate 20, Figure 9Shell white, stout, arcuate, ornamented with 14 strong annularribs of somewhat varying size. The interspaces are of the samewidths as the ribs, or wider, and are ornamented with fine axialriblets, which tend to become obscure on the annular ribs. Atintervals opaque white axial lines stand out against the ground colorof a more glassy white. The septum bears a rather long pointedprotuberance at the edge nearest to the convex side of the shell.The type. U.S.N.M. No. 536045, was collected by Dr. B. R. Balesat Bonefish Key, Florida Keys. It measures : Length, 3.2 mm. ; width(at lowest rib), 1.3 mm.This Caecum differs from all the other West Atlantic species inpossessing fewer and stronger, more distantly separated ribs.Genus FARTULUM Carpenter, 1857FARTULUM NEBULOSUM. new speciesPlate 20, Figure 8Shell small, arcuate, smooth, except for fine growth lines, vinaceous-brown, with irregular, white annular splotches of varying widths,often more or less wavy. x\pex constricted, closed with an acuminateseptum, the point near and directed toward the concave side of theshell. The aperture is slightly constricted, lip thin, simple. Oper-culum horny, circular, with many concentric whorls.The type", U.S.N.M. No. 536042, Mas collected by Dr. B. R. Balesat Bonefish Key, Florida Keys, and measures: Length, 2 mm., width,0.6 mm. NEW ANTILLEAN MOLLUSKS?REHDER 191This species differs from other Antillean members of this genusin the distinctive color pattern and its broad shape, constricted atboth ends. HALOPSEPHUS, 1 new genusShell small, solid, broadly conical, smooth, imperforate. Oper-culum calcareous, externally convex, sculptured by one whorl of axial,retractively curved, rugose riblets, which begin at the elevated nuclearportion, where they do not reach the margin, and gradually lengthenand reach the margin. Since the tops of these riblets are flush withthe convex surface of the operculum, the sculpture has the appearanceof curved, radial, vermiculiform grooves, irregular in the center ofthe operculum.Type : Halopsephus pulcher, new species.This interesting genus of Turbinidae differs markedly from allother Atlantic groups in its smooth shining surface and in itspeculiarly sculptured operculum. It may be near Taenioturbo Wood-ring, 1928 (genotype: Turbo canaliculatus Hermann), a questionthat the knowledge of the operculum of the latter species will help tosolve. HALOPSEPHUS PULCHER, new speciesPlate 20, Figures 3, 10Shell small, solid, broadly conical, of 5^4 whorls. Nuclear whorlsplanate, not sharply differentiated from the postnuclear whorls, witha sharply keeled periphery, the keel bearing broad, horizontally flat-tened spines, giving the early whorls a stellate appearance whenviewed from above; these spines disappear in the early postnuclearwhorls. Later whorls convex, smooth, except for some narrow, low,more or less obscure, spiral ridges in the supraperipheral area,appressed in the sutural region to the preceding whorl. The nuclearwhorls are pale scarlet, the later whorls becoming cinnamon-rufousto apricot-orange, lighter on the base. There are irregular radialwhite maculations running from the suture down over half of thesupraperipheral area, and other white spots of various shapes innumerous spiral rows of different widths over the whole shell; onthe periphery and also below the periphery are rows of white macu-lations, for instance, that resemble Arabic characters. Umbilicalregion indented but imperforate. Aperture circular, outer lip thin,simple; columellar lip evenly curved, thickened, slightly reflexed.Operculum as in generic diagnosis above.The type, U.S.N.M. No. 500638, measures: Height, 11.2 mm.;breadth, 11 mm. It was dredged off Lazaretto, Barbados, in shallow 1 aX6r, sea + ^7ju.-, to tarve, cngravc+;Ma, lid. NEW ANTILLEAN MOLLUSKS?REHDER 197 nuclear whorls covered with a rather persistent, yellowish-brownperiostracum, which is axially wrinkled by parallel ribletlike folds,which are especially strong near the suture, and run to the umbilicalregion. Four bands of rather regular, distantly spaced, oblong,chestnuts spots on a white base surround the last whorl, one each onthe shoulder and periphery, and two below the periphery. Betweenthe first and second bands and third and fourth bands there are brownbands, the upper one broader than the lower one; the ground color onthe rest of the shell is yellowish white. In the umbilicus is amoderately broad funicle ending in a heavy white callous pad.Aperture semicircular. Operculum with a smooth, somewhat concave,nuclear callus, elevated toward the outer edge (away from thecolumellar side) ; this is followed by a broad and then a narrowrounded rib; after a straight-sided, rather wide interspace comes arib which is joined to the following two thin lamellae at the top by anirregular, calcareous deposit formed of fused radial elements whichare swollen over the first thin lamella. At the marginal edge thisdeposit is pinched up into an irregularly nodulose crest.The type, U.S.N.M. No. 517060, measures, height, 14.8 mm.,breadth, 14.7 mm. It was collected at Peanut Island in Lake Worth,Fla., by Ted Bayer. Genus OOCORYS Fischer, 1883OOCORYS BARTSCHI, new speciesPlate 20, Fiouee 16Shell large, ovate, inflated, pale flesh colored. Nucleus brokenand worn but apparently consisting of 1.5 smooth whorls. Post-nuclear whorls 6+ , convex, spirally corded, the cords on the laterwhorls becoming flattened and equidistantly spaced. On the secondpostnuclear whorl the subsutural area becomes constricted and some-what appressed to the preceding whorl. In the last two or threewhorls this area is slightly concave and sculptured with finer spiralcords. The spiral sculpture is crossed by very fine axial growthlines. Aperture elongate-ovate, oblique, outer lip expanded and re-flexed, the reflexed lip made slightly wavy by the ends of the spiralcords, inner lip forming a thin glaze over the parietal wall and aslightly heavier one, with a free edge, on the entire length of thecolumellar area. Anterior canal rather broad, slightly recurved.Operculum horny, ovate, much smaller than the aperture, with a basalmarginal nucleus and many fine concentric growth lines.The type, U.S.N.M. No. 535689, was dredged in 79 to 140 fathomssouth of Tortugas on July 2, 1932, by Dr. W. L. Schmitt. It meas-ures : Height, 111.7 mm. ; breadth, 71.7 mm. 198 PROCEEDINGS OF THE NATIONAL MUSEUM vol.93This species is more than twice as large as the most closely relatedspecies, Oocorys barbouri Clench and Aguayo, from off northernCuba, and is, moreover, more inflated, is without a color band, and hasno headed spiral cord on the shoulder.A second, slightly smaller specimen, U.S.N.M. No. 417859, camefrom the Henderson collection and is labeled merely Florida.PSAROSTOLA,5 new genusShell small, slender. Nucleus inflated, glassy white, smooth, of l l/2whorls. Sculpture on postnuclear whorls consists of rather narrowribs crossed by strong spiral cords which form nodules on crossingthe ribs. Anterior canal hardly noticeable, siphonal fasciole weak.Aperture narrow; interior of outer lip denticulate, with a moderatelynarrow sinus below the suture ; inner lip smooth.Type: Columbella monilifera Sowerby, West Indies.This genus is apparently near Nassarlna Dall and Cigclirma Wood-ring but differs from them in that no attenuation of the base into ananterior canal is noticeable on the outer lip, being more like Zancis-sarina Pilsbry and Lowe, 1932, in this respect ; from this it differs inthe smaller, more inflated nucleus. Anachis tincta Carpenter fromCape San Lucas, Baja California, is apparently a member of thisgenus. PSAROSTOLA MONILIFERA SPARSIPUNCTATA, new subspeciesPlate 20, Figure 11Differs from the typical species in the reduction of the chestnutspotting on the whorls. Instead of the upper three spiral cords beingelongately maculated, only the two upper cords are furnished withshort spots and alternate axial ribs. Likewise, the spotting is weakerbelow the periphery on the last whorl. The shell is usually some-what broader in outline, and the axial ribbing may be a little strongerthan in the typical form.The type, U.S.N.M. No. 450778, measures: Height, 4.9 mm.;breadth, 2.1 mm. It was collected by John B. Henderson. Jr.. in 45fathoms southeast of Fowey Light, Fla., at Eolis Station 357. Inour collection we have other specimens from the Florida Keys andfrom the north coast of Cuba.This subspecies is therefore restricted to the region about theStraits of Florida, while typical monilifera we possess from Bermuda,Jamaica, and Haiti. 5 4>a.pfc, maculated + aroX-n, robe. NEW ANTILLEAN MOLLUSKS?REHDER 199BARTSCHIA, new genusShell large, solid, elongate-ovate. Nucleus dome-shaped, consist-ing of 314 smooth whorls. Postnuclear whorls sculptured withcrowded spiral cords crossed by close axial riblets, which give thesurface a closely nodulose appearance. Aperture pointed at theposterior angle, and broadly channeled at the anterior end. Anteriorcanal somewhat recurved. Outer lip internally thickened, the thick-ening bearing a row of denticles. Columella and parietal wallcovered by a smooth callus.Type : Bartschia significant, new species.rhis group has recently been assigned to Metula by Clench andAguayo (see below under description of genotype), but it does notbelong to that genus. The type of Metula H. and A. Adams, 1853,must i-e M. clatltrata Adams and Reeve (subsequent designation,Kobelt. Illustr. Conchylienbuch, vol. 1, p. 38, 1876), a Panamic species(see Tomlin, Journ. Conch., vol. 18, No. 6, p. 160, 1927). Woodringnow believes that his conclusion as to the type of Metula (CarnegieInst, Washington Publ. 385, p. 286, 1928) was unfortunate and thata tautonymic type designation cannot strictly and validly be main-tained. The Metula of Woodring (op. cit., p. 285) and other authorsis here given the new name Antemetula Render; gentoype : Buccinvmmetula Hinds.From this group Bartschia differs in its larger size and broaderaperture, which is not attenuated anteriorly, and in possessing ablunt nucleus. From Metula our genus differs in being: more fusi-form, with a longer spire and shorter, broader aperture not anteriorlyattenuated.It is with much pleasure that I name this striking group for mymentor and colleague, Dr. Paul Bartsch, whose Antillean explora-tions have so greatly advanced our knowledge of this region.BARTSCHIA SIGNIFICANS, new speciesPlate 20, Figure 17Shell large, solid, elongate-ovate. Nucleus bulbous, smooth, of 2>y^whorls. Postnuclear whorls about 5 1A, convex, sculptured by closelyspaced spiral cords (8 on the first postnuclear whorl), crossed byregular axial riblets, which gives the first 2% whorls a latticedappearance; thereafter finer spiral threads begin to be intercalatedbetween the cords until on the last whorl the spiral cords are ofirregular varying strength. Color yellowish white, irregularly macu-lated with varying shades of light chestnut. Last whorl descendingbut rising again at the aperture where there is a low broad external 200 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m varix. Aperture broadly fusiform, pointed above, terminating belowinto a short broad canal. Outer lip evenly arcuate, internallythickened, the thickening beset with short denticles decreasinganteriorly in size. Parietal wall and columella covered with a smoothcallus. Anterior canal short, somewhat recurved, siphonal fascioleindistinct.The type, U.S.N.M. No. 516493, was dredged by Dr. Paul Bartschoff the Tortugas, Fla. It measures : Height, 54.5 mm. ; breadth, 22.3mm. ; height of aperture, 26 mm.In our collection are three other specimens collected in 75-100fathoms from south of Ke3' West, off Sand Key.The only other species of this genus is that described as Metulaagassizi Clench and Aguayo (Mem. Soc. Cubana Hist. Nat., vol. 15,pp. 179-180, 1941) from off the north coast of Cuba, from which itdiffers in being stouter, not basally attenuated and in being externallycolored, not white. Metula fusiformis Clench and Aguayo (loc. cit.) , with its different nuclear characters, belongs to another genus.Genus PUSIA Swainson, 1840PUSIA HENDERSONI, new speciesPlate 20, Figure 12Shell of medium size, broadly fusiform, rather stout. Nucleusnarrowly conical, consisting of 4rAy? whorls, which are straight -sided, smooth, glossy, pale fuscous to straw yellow. Postnuclearwhorls (about 7 in the type) convex, sculptured with strong axialribs, and low, subobsolete spiral ridges. Basically the colorationconsists of a narrow sul peripheral band of white, above which thewhorls are usually pale yellowish white or occasionally darker; belowthe subperipheral band the whorls are fuscous to vinaceous-brown.The columella bears four plaits, which increase in strength towardthe uppermost one. These plaits are continued externally as spiralcords on the moderated long anterior canal. Outer lip simple,internally lirale deep within the aperture.The type, U.S.N.M. No. 414359, measures: Height, 14.8 mm.;breadth, 6.4 mm. It was dredged in 30 fathoms off Bears Cut, Miami,Fla. There are numerous other lots in the collection from Miamito Sand Key, near Key West, Fla.This species varies slightly in coloration as mentioned above andin the strength of the spiral sculpture; it may also be more slender.It is closest to Pusia cubana Aguayo and Render, but the whorls aremore convex and the spire is more elongate and straight-sided ; P.cubana is strictly bicolored and there is never a subperipheral bandnoticeable. NEW ANTLLLEAN MOLLUSKS?REHDER 201Other Antillean species that belong in Pusia are the genotype P.sulcata Gmelin (=microzonias Lamarck), histrio Reeve, trophoniaDall, and albocincta C. 13. Adams. Three other West Indies speciesthat belong here, but have stronger spiral sculpture, are P. pulchellaReeve, variata Reeve, and dermestina Lamarck.PUSIA EPIPIIANEA, new speciesPlate 20, Figure 14Shell in general similar to P, hendersoni but larger (apex broken,but 9 postnuclear whorls remaining) , with spiral sculpture somewhatmore obsolete and the subperipheral white band more conspicuous;below the band the shell is chocolate-brown and above the white bandthe color is chocolate-brown between the axial ribs, fading to pinkishon the ribs and becoming yellow just below the suture; on the pen-ultimate whorls the color is in general fainter.The type, U.S.N.M. No. 414278, measures: Height, 23.7 mm.;breadth, 9 mm. It was dredged in 15 fathoms off Tortugas, Fla., byJohn B. Henderson, Jr.Genus PUSIOLINA Cossman, 1921This group, proposed as a substitute for Pusiola Monterosato, 1917,not Wallengren, 1863, with the type tricolor Gmelin from the Med-iterranean, was considered by Monterosato to be a genus distinctfrom Pusia. Thiele, however (Handb. Syst. Weichtierk., vol. 1,p. 337, 1929), gave it only sectional value under Pusia. An examina-tion of the nuclear whorls of these two groups forces us to accept Mon-terosato's dictum and Pusiola with its bulbous nucleus of one to oneand a half whorls must be restored to generic rank, distinct fromPusia, which has a narrowly conical, straight-sided nucleus of aboutfour whorls. Mitra hanleyi Dohrn and genvmata Sowerby from theCaribbean region may be placed here, agreeing in general characterwith the genot3/pe but having four columella!1 folds instead of three.Until the radular characters are elucidated these species had betternot be separated solely on the difference in the number of folds. Herewe may also place the following new species.PUSIOLINA ^RfiSTA, new speciesPlate 20, Figure 1Shell rather large for the genus, narrowly ovate. Nucleus bul-bous, consisting of 1% convex whorls, the first V/2 whorls brown,the last half gradually becoming glassy gray. The following 5%whorls slightly convex, subsuturally somewhat flattened, distantlyaxially ribbed, and only very obscurely axially grooved. Color straw 202 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 9syellow or darker, with a peripheral band of white more or less ob-scurely and narrowly margined above and below with chestnut, andwith dark chestnut maeulations between the ribs. Columella bear-ing four plaits which are continued as cords on the short anteriorcanal : above these cords are one or two obscure, slightly noduloseones.The type, U.S.N.M. No. 517056, measures : Height, 10 mm., breadth,4.7 mm. It was collected in 3-6 fathoms at Santa Rosa on the northcoast of Pinar del Rio, Cuba, during the Tomas Barrera Expedition.Three paratypes were collected at the same place, and one specimen wasfound at La Esperanza, Pinar Del Rio, Cuba.Genus FENIMOREA Bartsch, 1934FENIMOREA MOSERI BRUNNESCENS, new subspeciesPlate 20. Figure ?">Similar in shape and nature of axial and spiral sculpture to typicalFenimorea moseri (Dall) from the lower west coast of Florida, butof a uniform light vinaceous-cinnamon color (Ridgway's ColorStandards), except for the two glassy white nuclear whorls.Type. U.S.N.M. No. 517055. measures: Height, 23 mm.; breadth,8.4 mm. It was dredged in 14 fathoms off Fort Walton, OkaloosaCounty, Fla., by Maxwell Smith.This is an interesting race from the coast of the "panhandle" ofFlorida, a conchologically little-known region.Genus CRASSISPIRA Swainson, 1840CRASSISPIRA (CRASSISPIRELLA) MESOLEUCA, new speciesPjlate 20, Figure 15Shell solid, elongate-ovate, with a narrowly conic spire. Nucleuslow, rounded, of almost 2 smooth whorls. Postnuclear whorls axiallyribbed, the ribs crossed by spiral cords, which on the later whorlsbecome slightly nodulose and whitish where they cross the axial ribs ; fine threadlike striae are found in the spaces between the strongerspiral cords and between the shoulder of the whorls, where the axialribs end, and the suture; in this space there is also a rather strongsubsutural keel. The color is usually of varying shades of chestnut,becoming occasionally almost blackish and rarely yellow; the endsof the ribs at the shoulder are decidedly whitish and the subsuturalarea may be lighter in color. Aperture narrow, outer lip with adee]) sinus Between the subsutural keel and the shoulder. Anteriorchannel rather broad and rather shallow; a trace of a stromboidnotch is evident, Basal fasciole weak, closely spirally corded. NEW ANTILLEAN MOLLUSKS?REHDER 203The type, U. S. N. M. No. 411906, was collected by John B. Hender-son. Jr., on Looe Key Reef, Fla , and measures: Height, 16.6 mm.;breadth, 6.6 mm. Specimens in our collection show that this speciesis restricted, as far as is known, to the lower Florida keys, fromBiscayne Bay to the Tortugas.This species is distinguished from the other Antillean members ofthis group by its broader form, shorter spire, and distinctive whitespotting of the upper part of the axial ribs.Genus PYRGOCYTHARA Woodring, 1928PVRGOCYTHARA FILOSA, new speciesPlate 20, Figure 2.Shell rather small, elongate-ovate, solid. Nucleus dark brown,globose, V/2 whorls, the first \\% whorls smooth, the following V4whorl with fine, closely spaced, axial riblets. Th< postnuclear whorlsare strongly axially ribbed (10 on the penultimate whorl), the ribsstrongly angled at the shoulder; in the early whorls a spiral cordoccurs on the shoulder, and there are several below ; on the last twowhorls these spiral cords increase in number but at the same timebecome obscure. Color brown except for a rather broad, spiral, yel-lowish white band on the shoulder of the whorls. Aperture somewhatnarrow; outer lip internally thickened under the varixlike axial rib,posterior sinus broad, as is the anterior channel. Interior brownishin color.The type, U.S.N.M. No. 27637, measures: Height, 6.5 mm.,breadth, 2.8 mm. It was collected by Henry Hemphill at Marco,Fla. There is one paratype from the same lot.This species differs from the only other described recent speciesof Pyrgocythara (P. hemphilJi Bartsch and Rehder, 1939) in beingsmaller and in having a different color pattern. U. S. GOVERNMENT PRINTING OFFICE: 1942 U. S. NATIONAL MUSEUMm '-"> PROCEEDINGS. VOL 93 PLATE 19 X V Si I \ *Q& x~> ??%< ->s"