974 PROCEEDINGS OP THE NATIONAL MUSEUM. vol. xxvi. 



(hi Furca abnormal. 



r Anterior or termimil setu of furcu Ini^^sin<r. Eye rudinientary, disa])- 



IH'urinK' with a^e Ti/iiJilori/pris, 'AO. 



ee Posterior or dorsal seta missing. Unmchial plate of :^) setie. 



Caiuiondjinix, .'!!. 

 Ill) Shell retieulaled, luiniil. Small, not more than 0.8 mm. in length. 



I'drac'indona, H2. 



The roUowino- text contains a few revised o-cnerie desei'ii)tion,s — 

 notably that of the g-enus Cypris — as also short keys to the known 

 North American species. A few other forms ai-e inchided for ]jiir- 

 poses of comparison ; tiiese, however, l)eino- marked witli an asterisk (■^■). 



I. Sulalkiiiily ISTOTODROTv^^^lDIN^JK. 

 1. NOTODROMAS Lilljeborg, 1853. 



Monoculus JuRiNE, Ilistoire des Monocles, qui se trouvent aux environs de Geneve, 

 1820. — LiLLJEHom;, De C'rustaceis ex ordinibus trii)us, 1858, p. 94. 



('ijproh Zenker, Monographic der Ostracoden, 1854, p. 80. 



Notodronias Bkady and Nor.max, A Monograph of the marine and fresh water 

 Ostracoda, Trans. Koyal Dublin Soc, 1889, p. 95. 



Shell high, smooth. Natatory setse reach to tips of terminal claws. 

 Second antenna^ six-segmented in both sexes. First maxillary process 

 with six toothed spines. Second foot four-segmented, terminating;- in 

 three setsB, of which two are directed backward. Branchial plate of 

 tw^o seta?. Furca with the two terminal claws seta-like, terminal seta 

 missing, so that furca seems to end in three seta\ Two eyes, separate. 

 Sexual. 



a Female with spine-like projection at lower posterior extremity of shell. Sliell 

 smootli, noticeably quadrangular N. inomicJia O. F. Midler. 



2. NEWHAMIA King, 185S. 



Nev'lmmkt King, On Australian Entomos., Proc. Royal Soc. Van Diemans Land, 

 III, 1855. — Vavra, Die Ostracoden vom Bisniarck-Archii)el, 1901, p. 179. 



Shell roughly granulate^ or tuberculate on outside. Natator}- sette 

 reaching tips of terminal claw^s. Second antennae six-segmented in 

 both sexes, that of female terminating with a simple terminal seta, 

 while that of male terminates with a coarsely toothed spine. Bran- 

 chial plate missing. Terminal seta of furca is usually present in male, 

 but lacking in female. Two separate eyes. Second foot with three 

 setfe of ditlerent lengths, one almost claw-like. Ductus of numerous, 

 thii;kly arranged, chitinous whorls. Furca normal, l)ut terminal seta 

 occasionally missing in female. 



This geiuis includes but two species at present, N'. patagomcaYnyra 

 (189S) from Patagonia, and iV: fcnei>tra King, Vavra (1901), from Bis- 

 marck Archipelago. 



