ROTATOKIA OF LOS ANGELES, CALIFORNIA, AND VICIN-ITY, WITH DESCRIPTIONS OF A NEW SPECIES.By Frank J. Myers,Of Bethlehem, Pennsylvania.INTRODUCTION.The collections upon which this report is based were made by thewriter from January to May, 1916. While the number of specieslisted is not large, the record is interesting in view of the fact thatnothing is known of the Rotatoria of California; it is hoped thatlocal students may take up the subject and extend the list.Los Angeles is situated on a narrow, level plain intervening be-tween the foot of the San Gabriel Mountains and the Pacific Ocean.The Los Angeles River, which passes through the city, has the usualcharacteristics of mountain streams ; at times it is torrential and atother times its bed is practically dry.On account of the narrowness of the level plain no large lakes exist,and as there are but two seasons, a rainy and a diy one, permanentpools and ponds are not numerous. The majority of the collectionsare consequently from artificial reservoirs and ornamental pools inand around the city. Through the kindness of Mr. WiUi MulhoUandI obtained access to the various storage reservoirs from which thewater supply of the city is obtained.Ml'. H. K. Harring, of the United States National Museum, hascooperated in the determination of some of the species and added anote on Pleurotrocha daphnicola.For convenience the different localities at which collections weremade are referred to by numbers, as foUows:1. Permanent pool, about 1 acre in area, formed by surface drain-age and overflow from a small artificial lake in East Lake Park,Los Angeles.2. Slowly running water in BaUona Creek, a very small streamabout 4 miles west of Los Angeles.3. From service pipe of the city water supply.4. Nigger Slough, a large body of water about 11 miles south ofLos Angeles, supplied by surface drainage and melted snow from theSan Gabriel Mountains.Proceedings U. S. National Museum, Vol. 52-No. 2190. 473
474 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52.5. Edge of a swamp north of the town of Riverside.6. Ornamental pool on alligator farm, near East Lake Park, LosAngeles.7. Pool formed by the Los Angeles River at a point about 14miles south of the city, on highway to Long Beach.8. Artificial lake in West Lake Park, Los Angeles.9. Artificial lake in Echo Park, Los Angeles.10. Silver Spring reservoir, eastern section of Los Angeles, nearSunset Boulevard.11. Buena Vista reservoir, Elysian Park, Los Angeles.12. Ornamental fountain in St. James Place, Los Angeles.LIST OF THE SPECIES COLLECTED.Notommata cerherus (Gosse), 12.Notomnmta pacJiyura (Gosse) = Copeus pachyurus Gosse, 11.Notommata tripus Ehi-enberg, 10.Taplirocampa annulosa Gosse, 1, 3, 6, 12.Proales decipiens (Ehrenberg), 1, 6.Pleurotrocha petromyzon Ehrenberg, 1, 3, 4, 5, 7.Pleurotrocha dapJinicola (Thompson) = Proales daphnicola Thomp-son, 4.Eosplwra najas Ehrenberg, 7. Not previously recorded from theUnited States.CepJialodella catellina (MiXUeT) = Diglena catellina (Miiller), 1,2, 6, 11.CepJialodella forjicula (Ehrenberg) = Furcularia forficula Ehren-berg, 1, 2, 3, 6, 8, 12.DiascMza auriculata (M^^r) = DiascMza lacinulata (Miiller), 1, 10.Diaschizaforficata (Ehrenberg) = DiascMza caeca Gosse, 2, 6.Diascliiza gihha (Ehrenberg), 1, 2, 3, 4, 6, 9, 11, 12.DiascMza glohaia Gosse, 6.DiascMza gracilis (Ehrenberg), 5, 6.DiascMza Jioodii Gosse, 1, 5, 6, 10. Not previously recorded fromthe United States.DiascMza tenuior Gosse, 1, 6, 10, 11.Monomm/ita orhis (Muller) = Furcularia longiseta (Miiller), 5.DicranopTiorus fordpatus (MuRer) = Diglena forcipata (Miiller), 1,2, 3, 6, 11.Encentrum felis (Miiller) = ProaZ^s felis (Miiller), 5.Epiplianes senta (Miiller) = Hydatina senta (Miiller) , 1
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Braclhionus angularis Gosse, 1, 8, 9.BracTiionus angularis caudatus Barrels and Daday, 4, 8, 9.BracMonus calycijlorus Pallas = J5mcMonus pala Ehrenberg, formdorcas Gosse, 1; form ampMceros Ehrenberg, 1, 4.BracMonus capsulijiorus Pallas; form hakeri Ehrenberg, 1, 2, 3,4, 5, 6, 7, 8, 9, 10, 11, 12; form urceolans Miiller, 1, 5, 9.
NO. 2190. ROTATORIA OF LO^ ANOELES, CAL.?MYERS. 475Bracliionus patulus MiXiler = BracMonus militaris Elirenbcrg, 3.Brachionus plicatilis MiiWer = Brachionus mulleri Ehrenberg, 8.Brachionus variahilis Hempel, 2, 4.This species, originally described from the Illinois River, at Havana,Illinois, was found very abundant. It is commensal on Daplmialongispina (Miiller) and CeriodapTinia longispina (Miiller), whichappears to have been unknown to Hempel; nearly every Daphnidcarried about a number of these no doubt unwelcome guests, attachedto the carapace. Wlien swimming about by the action of its owncilia, Brachionus variabilis behaves very much as other speciesof this genus, but when deciding to use a Daphnid for conveyance,it attaches itself with astonishmg rapidity, almost jumpmg uponthe host. Some of the numerous varieties are illustrated on plate40, figures 1-5. The posterior spmes are found m all lengths and inindividuals of all ages; no evidence was observed that would tendto confirm Hempel's suggestion: that only the young have spines,which with advancing age are absorbed. As nothing similar hasever been reported for other species of the genus, it is probablysafe to dismiss it as unfounded.Brachionus variahilis may be easily recognized by the subquadrateplate projecting over the foot opening; it is therefore evident thatthe animal figured by Murray m Notes on the Natural History ofBolivia and Peru (p. 26), does not belong to this species, but is nodoubt one of the varieties of Brachionus capsulijlorus Pallas, probablythe form usually called B. urceolaris.Platyias quadricornis (Ehrenberg) = Noteus quadricornis Ehrenberg,3, 4.Keratella cochlearis (Gosse) = Anuraea cocJdearis Gosse, 1, 4, 7,9, 12.Keratella quadrata (^liiller) = Anuraea aculeata Ehrenberg, normalform, 1, 3, 4, 7, 8, 10; form valga Elirenberg, 1, 2, 3, 4, 7, 9.Notholca striata (Miiller), 1, 2, 3, 10.Mijtilina mucronata (Miiller) =Salpina mucronata (Miiller), 1, 6.Ilytilina ventralis (Ehrenberg) = Salpina ventralis Ehrenberg,normal form and form hrevispina Ehrenberg, 11.Euchlanis deflexa Gosse, 1, 3, 5, 6, 7, 10, 11.Euchlanis dilatata Ehrenberg, 1, 2, 5, 6, 11.Euchlanis lyra Hudson, 3, 10. Not previously recorded from theUnited States.Euchlanis plicata Levander, 11.As the figui'e accompanyuig the original description is somewhatdiagrammatic, this apparently rare species has been illustrated onplate 41 , figures 1-3. It has not previously been found in the UnitedStates.Euchlanis pyriformis Gosse, 11.Euchlanis triquetra Ehrenberg, 3, 5.
476 PR0CEEDIN08 OF THE NATIONAL MUSEUM. vol. 52.LECANE ASPASIA, new species.Plate 40, figs. 6-8.The lorica is broadly oval and nearly parallel-sided anteriorly.The anterior dorsal and ventral edges are comcident and slightlyconvex; at the lateral edges they are produced as two small spines.The dorsal plate is ovate and its anterior margin slightly narrowerthan the ventral plate; its markings are moderately prominent andfairly regular. The ventral plate is at its widest point of the samewidth as the dorsal plate; it has a well-marked transverse foldsome distance in front of the foot. The longitudinal markings arerather faint. The posterior segment of the body is broadly romidedposteriorly and projects slightly beyond the dorsal plate. The firstfoot joint is nearly parallel-sided and projects over the movablejoint with a minute median rounded lobe. Tlie movable joint isbroad, rounded anteriorly and sharply constricted immediately mfront of the toes. The coxal plates are approximately triangular.The toes are long, slender, and parallel-sided, ending m acutelypointed claws. The body is of more than average depth.Total length 132 fi; length of lorica 94 ju; width of anterior spines 63IX, length of spmes 4 /x; length of dorsal plate 82 n, width at widestpomt 73 IX, width of anterior edge 54 /x; width of ventral plate 75 fx;length of toes without claw 30 ix, length of claw 8 fx; depth of body50 M.Type.?Cat. No. 16832 , U.S.N.M., is from a pool on alligator farm,near East Lake Park, Los Angeles.With the large number of species belonging to this genus, differingonly in minor details, comparisons are of little value; the presentspecies has some resemblance to Lecane arcula Harring, but is broaderand stouter, as well as being considerably larger.Lecane curvicornis (Murray) = Cathypna curvicomis Murray, 7. Notpreviously recorded for the United States.Lecane liomemanni (Ehrenberg) = Cathypna hornemanni (Ehren-berg), 11.Lecane luna (M-iJ^^er) = Cathypna lunxi (Muller), 1, 2, 6, 10, 11, 12.Monostyla bulla Gosse, 3, 5, 7, 12.Monstyla closterocerca Sclmaarda, 1, 3, 5, 12.Monostyla cornuta (Muller), 4.Monostyla hamata Stokes, 3.Monostyla lunaris Ehrenberg, 4, 10.Monostyla quadridentata Ehrenberg, 4, 10.Monostyla stenroosi Meissner = Monostyla hicomis Stenroos, not ofDaday. 3, 5. Not previously recorded for the United States.Lepadella acuminata (Ehrenberg), 1, 11.Lepadella patella (Mtiller), 1, 3, 5, 6, 7.Lepadelh rhomboides (Gosse), 1,3.
NO. 2190. ROTATORIA OF LOS ANGELES, CAL.?MYERS. 477Lepadella triptera Ehrenberg, 6.Colurella ohtusa (Gosse), 1, 4, 5, 7, 9. 12.Colurella uncinata (MiiUer), 3.Sguatinella mutica (Ehrenberg) = StepJianops muticus Ehrenberg, 3,5, 6, 12.Trichotria pocillum (MuWei') = Dinocliaris pocillum (MuUer), 1, 5,6, 10.Trichotria tetractis (Ehrenberg) = Dinocliaris tetractis Ehrenberg, 2,5, 6, 7, 10.Wolga spinifcra (Western) = Distyla spinifera Western, 4.Loplwcharis oxysternon (Gosse) = Metopidia oxysternon Gosse, 1,3,6.Macrochaetus collinsii (Gosse) = Dinocliaris collinsii Gosse, 5.Scaridium longicaudum. CMiiller), 1, 3, 5, 8.Trichocerca longiscta (Schrsiuk) = Battulus longiseta (Shrank), 5.Trichocerca scipio (Gosse) = Rattulus scipio (Gosse), 5.Diurella hrachyura (Gosse), 1,6.Diurella tigris (M tiller), 1.Diurella tenuior (Gosse), 1, 6, 11, 12.Diurella weheri Jennmgs, 1, 2, 6.Syncliaeta oUonga Ehrenberg, 6 10.Syncliaeta pectinata Ehrenberg, 1, 4, 8,, 10,Syncliaeta stylata Wierzejski, 8.Syncliaeta tremula (MtiUer), 1, 2, 3, 5, 9, 10, 12.Polijarthra trigla lS,hTenheTg= Polyartlira platyptera Ehrenberg, 1,2,4, 6, 7, 8, 9, 11,' 12.Asp'lanclina hrightwellii Gosse, 1, 2, 4, 9.Asplanchna priodonta Gosse, 1,4.Asplanchnopus multiceps (Schrank), 4.Testudinella patina (Hermann) =Pier'0(Zma patina (Hermann), 3.Pedalia mira (Hudson) = Pedalion iniruin Hudson, 3, 4,Filinia longiseta (Ehrenberg) = Triarthra longiseta Ehrenberg, 8.Floscularia ringens (Lmnaeus) = Melicerta ringens (Linnaeus), 1, 5,6, 10, 12.Ptygura crystallina (Ehrenberg) = Oecistes crystalUnus Elirenbcrg,6, 12.Ptygura mucicola (Kellicott) = Oms^^s 7nucicola Kellicott, 12,Ptygura longipes (Wills) = Oecistes umbella Hudson, 6. Not previ-ously fomid m the United States.Ptygura velata (Gosse) = Oecistes velatus Gosse, 6, 10.CoUotlieca cornuta (Dohie) = Floscularia cornuta Dobie, 1, 6.CoUotheca coronetta (Cubitt) = Floscularia coronetta Cubitt, 1, 6.Colloiheca ornata (Ehrenberg) = Floscularia ornata Ehrenberg, 6.No study was made of the Bdelloida.
478 PROCEEniNCl^ of the NATIO^WL MUSEUM. vol.52.PLEUROTROCHA DAPHNICOLA (Thompson). iPlate 41, figs. 4-9.Proales daphnicola Thompson, Science Gossip, vol. 28, 1892, p. 220, text figure.
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Murray, Trans. Royal Soc. Edinburgh, vol. 45, 1906, p. 179, pi. 6, fig. 26.fPleurotrocha sigmoidea Skorikov, Trav. Soc. Nat. Kharkow, vol. 30, 1896, p. 284,pi. 7, fig. 8.Thompson's original description is very good and there is butlittle to add to Mr. Myers's figures of the animal, plate 41,figures 4 and 5 ; Thompson calls attention to the ' ' remarkably long "foot glands with "their ducts plainly openmg as projecting tubulesat the extremity of the large, swollen toes." At the base of thetoe there is a fairly large mucus reservoir.Tlie trophi, figures 6 to 9, present an interesting modificationof the virgate or "pumping" type. The rami are approximatelyhemispherical, cuplike structures, functioning as the cylinder ofthe "pump"; of the usual transverse ridges only the basal one ispresent, takmg the form of a prominent, hornlike process. On theimier surfaces of the rami, from the tip of the horn to the posterioror dorsal pomt, there is a series of close-set, needlelike teeth, shownin figiu-e 8. These teeth obviously play no part in the mastica-tion of the food, but they explain fully how the animal attaches itselfto the skin of worms, as reported by Murray in the paper cited above.The mici rest on the dorsal portions of the rami, in the sinus behindthe ventral horn. Each uncus has five teeth, two ventral, pointed,and three dorsal, with rounded, knobhke tips.EXPLANATION OF PLATES.Plate 40.Fig. 1. Brachionus variabilis, dorsal view; page 475.2. Brachionus variabilis, dorsal view.3. Brachionus variabilis, dorsal view.4. Brachionus variabilis, ventral view.5. Brachionus variabilis, lateral view.G. Lccane aspasia, dorsal \'iew, page 476.7. Lecane aspasia, ventral \'iew.8. Lecane aspasia, lateral view.
~^ Plate 41.Fig. 1. Euchlanis plicata, lateral view; page 475.2. Euchlanis plicata, dorsal \'iew.3. Euchlanis plicata, transverse section of body.4. Pleurotrocha daphnicola, lateral view; page 478.5. Pleurotrocha daphnicola, dorsal view.6. Pleurotrocha dahpnicola, trophi, ventral v-iew.7. Pleurotrocha daphnicola, trophi, anterior \dew.8. Pleurotrocha daphnicola, internal surface of left ramus.9. Pleurotrocha daphnicola, trophi, lateral view.
1 Note by H. K. Harring, U. S. National Museum.
U. S. NATIONAL MUSEUM PROCEEDINGS, VOL. 52 PL. 40
Rotatoria from Los Angeles, California.For explanation of plate see page 478.

U. S. NATIONAL MUSEUM PROCEEDINGS, VOL. 52 PL. 41
Rotatoria from Los Angeles, California.For explanation of plate see page 478.