NO. 1347. FRESH-WATER OSTRACODA—SriARPE. 995 



Shells approximately .same height. Second antennae six-segment 

 in male, five-segmented in female, no sense organ on dist-it end of 

 fourth segment. 



Natatory seta? very long. Terminal Segment of second foot, long 

 and narrow, three times as long as broad. Ductus of numerous long 

 filaments, not on a distinct central axis, l)ut all inclosed in a sack. 

 Penultimate segment of second foot Avith a coarse seta on dorsal distal 

 angle. Furca as in Cypria. 



Kaufmann speaks of one of the smaller terminal seta- of the second 

 feet as being bent S-shaped, and uses it as of generic value. Since 

 this is not true of C. globosa^ at any rate, 1 have omitted this as a 

 genus character. Three species have been reported from America. 



a Anterior edge of furca a})out twice as long as its terminal claw. ./cTr/'.s- (). F. Miiller. 

 aa Anterior edge or furca clearly more than twice as long as its terminal claw. 

 h Anterior edge of furca about two and one- half times length of terminal claw. 



c The terminal claws of furca strong and much })ent .forhe.v Sharpe. 



cc Terminal claws of furca slender and not l)ent modestn (Herrick). 



bb Anterior edge of furca about three times length of terminal claws. Terminal 

 claws strong, nearly straight, weakly bent near end. Furca toothed on poste- 

 rior edge, also with comb of teeth on its side globosa* Sars. 



26. PONTOPARTA Vavra, 1901. 

 Potiioparta Vavra, Die Ostracoden vom Bismarck-Archipel. Prag., 1901, p. 184. 



Shell white, smooth. Natatory setie reaching approximately to tips 

 of terminal claws. Terminal segment of second foot cylindrical, not 

 ])ill shaped, with two terminal bristles and a long reflexedone. Males 

 unknown. Furca strong, with two end claws, a terminal seta, and 

 two dorsal ones. 



This genus has been established by Vavra with P. mm as the type, a 

 peculiar form from Bismarck Archipelago. 



No American forms known. 



27. ILYOCYPRIS Brady and Norman, 1889. 



Monoculm Jurine, Histoire des Monocles cjui se trouvent aux environs de Geneve, 

 1820. 



Ihiocypris Brady and Norman, A ISIonog. of the marine and fresh-water Ostra- 

 coda. Sec. I, Trans. Royal Dublin Soc, 1889, }). 106.— Kacfmann, Cypri.len 

 und Darwinuliden der Schweiz, Revue Suisse de Zool., VIII, 1900, p. 343. 



Shell hard, entire surface usually pitted or tubercled, and furrowed 

 in region of eyes, thus resembling marine forms or Liinnlci/their. 



Natatory seta^ reaching approximately to tips of termhial claws. 

 Ductus composed of eighteen or twenty spirally wound chitinous setaN 

 in sack. Second foot live-segmented, its terminal segment cylindrical 

 and with three long set* of different lengths, all pointing in same gen- 

 eral direction as foot. Penultimate segment of second foot with from 

 two to three seta?. Furca strong, usually with combs of cilia on dorsal 

 margin or sides. 



Proc. N. M. vol. xxvi— 02 66 



