354 



CRUSTACEA 



Key to the genera of Cypridae here described: 

 o x Second antennae with natatory bristles. 

 &! Animals in fresh water. 

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



d 1 Caudal furca long, each side with 2 terminal bristles 1. CYPRIS 



d 2 Caudal furca rudimentary 2. CYPRIDOPSIS 



c 2 Second foot terminates with 2 straight bristles 3. CYPRIA 



6 3 Animals marine 5. PONTOCYPBIS 



a a Second antennae without natatory bristles ; animals cannot swim. 



4. CANDONA 



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

 5-jointed, the 5 natatory bristles extending to the tip of the terminal 



8 



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 S 

 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. 557 



Fig. 558 



Fig. 559 



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

 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. 



