354 CRUSTACEA 



Key to the genera of Cypridae here described : 



«! Second antennae with natatory bristles. 

 hi Animals in fresh water. 

 Ci Second foot terminates with 1 long straight and 1 short curved bristle. 



di Caudal fnrca long, each side with 2 terminal bristles 1. Cypris 



do Caudal f urea rudimentary 2. Cypridopsis 



Cj Second foot terminates with 2 straight bristles 3. Cypria 



62 Animals marine 5. Pontocypris 



Ca Second antennae without natatory bristles ; animals cannot swim. 



4. Candona 



1. Cypris 0. F. Miiller. Eye single, median; second antennae 



5-jointed, the 5 natatoiy bristles extending to the tip of the tenninal 



3'' '' B 



Fig. 556 — Cypris virens (Siissw. F. Deut.). A, left shell; B, diagram showing 

 organs. 1, eye; 2, first antenna; 3, second antenna; 4, mandible; 5, first maxilla; 

 6, second maxilla ; 7, first leg ; 8, second leg ; 9, liver ; 10, abdomen ; 11, ovary ; 12, 

 anus ; 13, intestine. 



bristles; first maxilla with a large and second maxilla with a small 

 branchial plate; parthenogenetic, the males being unknown: about 8 

 American species. 



C. virens (Jurine) (Fig. 556). Length 1.69 mm.; height .95 mm.; 

 breadth .9 mm. ; shell highest just back of the eye and covered with short 



Fig. 559 



Fig. 557 — Cypris fuscata (Siissw. F. Deut). Fig. 558 — Cypridopsis vidua (Siissw. P. 

 Deut.). Fig. 559 — Cypria exculpta (Sharpe). 



hairs; dorsal side bluish-black; lateral sides greenish with yellowish 

 areas extending diagonally downwards from the region of the eye : cosmo- 

 politan. 



C. fuscata Jurine (Fig. 557). Length 1.5 mm.; height .9 mm.; 

 breadth .7 mm. ; shell renif orm and greenish-brown in color with pellucid 

 spots and a bluish-black patch on either side: cosmopolitan. 



