1 



\)\)S PRO<'EEI)IN<iS OF THE NATIOXAL MUSEUM. vol. xxvi. 



Family CYTHERID.E. 



33. LIMNICYTHERE Brady, 1 



Ojfthcrc Baiki), The Nat. Hist, of the British P:ntonios., Ray Society, 1850, p. 163. 

 Ac<nith(i])iix \'kknet, Acanthopus, uii nouveau genre d'Ostracodes, Forel's Mate- 



riaux pour servir a I'etude de la faune profonde dii Lac Leman, Ser. 4. 



1878, p. 506. 

 Limnocythere Dahl, Die Cytherideu der westlichen Ostsee, Zool. Jalirlracher, 



III, Abth. f. Systematik, 1888, p. 597. 

 Limiilci/tJicre Brady, A Monoo;. of the recent British Entonios., Trans. Linn. Boc, 



XXVI, Pt. 2, 1868, p. 419. — Brady and Norman, A Monog. of tlie marine and 



fresh-water Ostracoda, Sec. I, Trans. Royal Du})lin Soc, 1889, p. 170. — Vavra, 



Monog. der Ostrac. Bfihrnens, Arch. Naturw. Durchforsch. \. Bohmen, 



VIII, 1891, p. 107. 



Shell strong', irregularly tuberculate or spinous, rather thin. First 

 pair of antenna^, five-segmented, with short bristles on their outer 

 edge; second pair four-segmented, the '"spinning claw"" ])eing either 

 two segmented or unsegmented. Branchial plate of the mandil)le 

 strongly developed (commonly rudimentary in other members of this 

 group). Furca rudimentar3% commonly but two short bristles. Males 

 uncommon. 



a Terminal segment of finst antennte seven times as long as wide. Furca cylindrical, 

 about three times as long as wide. Terminal claw of sei-ond antenna of male 



smooth reticulaUi Sharpe. 



aa Terminal segment of first antennpe four or five times as long as wide. Furca 

 lamellar, six to seven times as long as broad, ending in a bristle. Terminal 

 claw of second antenna of male armed with three or four strong teeth. 



illinoisensin Sharpe. 



Family DARWINULID.l^. 



34. DARWINULA Brady and Robertson, 1872. 



Polycltdcs Brady and Robertson, The Ostracoda and Foraminifera of Tidal 

 Rivers, Ann. and Mag. of Nat. Hist., VI, 1870. 



Daruhnila Brady and Norman, A Monog. of the marine and fresh-water ( )stra- 

 coda, Sec. I, Trans. Royal Dublin Soc, 1889, p. 121. — Kaufmaxn, Cypriden 

 und Darwinuliden der Schweiz, Revue Suisse de Zool., VIII, 1900, p. 393. 



Shell, smooth and fragile. Right shell larger than the left. First 

 antenna? shorter than in the Cyprididfe, and armed with stout sette. 

 Second antenna^ four-segmented, with four or five terminal claws, and 

 without "spinning seta" or "sense seta."' First maxilla with a large 

 branchial plate. First pair of feet five-segmented, and shorter than 

 the second pair. Furca subconical, small. 



a First antennfe six-segmented, the second four-segmented. Antepenultimate seg- 

 ment of second antenna without a conspicuous one-jointed appendage. 



MeveiiMmi Brady and Robertson. 



aa First and second antenna? five-segmented. Antepenultimate segment of second 



antenna with a conspicuous one-jointed aj>pendage, which terminates in one 



long and one short filament iniprurl>«i Turner. 



