NO. 1347. FRESH-WATER OSTRACODA-SIIAIU'E. 981 



III. Svil>rainily 0^'T>KIl>IiV>H:. 



Q. CENTROCYPRIS Vavra, 1895. 



(W//TOr//j^r/.s Vavka, 8iusswas8er-0«traco(lon Zanzibarn, Bfiheft .1. llaml. WiH.« 

 Anstalten, XII, 1895, p. 15. 



Two (listiiK't eves. Shell unusually stronjr. Natatory sctsc reach- 

 ing well beyond terminal elaws. Two last segments of second antennjo 

 with weak seta-like spines. First mandibular process with four plain 

 spines. Third and fourth segments of second feet long and nai-row. 

 Propagation, sexual. Ductus thickly covered with closely arranged 

 rows of chitinous spines. No American forms known. 



This genus was established by Vavra to receive a very strikingly 

 spinous form from Zanzibar. 



10. CYPRIDELLA Vavra, 1895. 



Cj/ijridella Vavra, Siisswass. Ostrar. Zanziliars, JV'ilit'ft d. Ilamh. \\'is,<. Anstal- 

 ten, XII, 1895, p. 7. 



Shell short and tumid. Natatory setie reach to tips of end i-laws. 

 Furca, normal. Propagation, sexual. The testes originate in the ante- 

 rior part of the shell and extend to the lower posterior part, interme- 

 diately forming three or four concentric half circles. Their anterior 

 origin in circles seems to be a characteristic of but two other genera — 

 Sj>/'ro('i/j)ris and (ijprtcercus. 



Genus established l)y Vavra to receive a form found in Zan/.ibur. 



No American forms known. 



11. SPIROCYPRIS, ne\A^ genus. 



Shell excessively hairy; plump. Natatory setie simple, reaching 

 barely beyond the terminal claws. Feet, as in Cyprh. Caudal rami 

 normal, slender, and not more than one-half length of shell. Propa- 

 gation sexual. Testes of male originating in anterior half of sIk^II and 

 arranged in form of concentric circles. 



This genus is established to receive an excessively hairy Ostracod. 

 having testes arranged in an unusually pronounced concentric whorl 

 in anterior part of shell. It differs from Ciipridelhi in form of testes, 

 which in CyprideUa is in form of four half circles, also in being much 

 larger; from Oypricercnx^ its nearest relative, in shell characters and 

 size of furca. 



These three genera are seemingly the only ones so far known diar- 

 acterized by testes originating in circles in anterioi- i^art of shell. 



a Rhell about twice as long ^^ high, excessively hairy. Tistrs arrangeil in form of 

 about four concentric circles in anterior part of shell. iMnca alwut one-halt as 



1 11, ../Kf.wnm ShariK' 

 long as shell ' ' • 



