128 CRUSTACEA. 



abdomen of four segments; antennae not two- 

 branched ; eye in male stalked. 



A. Patersonii. Fig. 215 ; f . 



FAMILY IV. CETOCHILIDA 



CetocJiilus (Vauz&me). Head with two small 

 styles ; antennae two-branched ; foot-jaws not 

 branched; thorax of six, abdomen of four segments ; 

 last pair of feet of the same form as the others. 

 C. septentrionalis. Fig. 216 ; -f . 



TRIBE II. OSTRACODA. 



Two eyes ; two pairs of feet Cypridinadae. 



One eye ; three pairs of feet Cytherida. 



FAMILY I. CYPRIDINAD.E. 



Cypridina (M.-Edw.). Eyes two, stalked; 

 antennae two pairs, both foot-like ; feet two pairs, 

 one pair always within the shell, and of a peculiar 

 structure ; abdomen ending in a broad plate, armed 

 with strong hooks. 



C. Macandrei. Fig. 217 ; mag. C. interpunctse. 

 brenda. MariaD. 



FAMILY II. CYTHERID.E. 



Cythere (Miill.). Eye single ; feet three pairs, 

 all external; abdomen short; inferior antennae 

 with one long, curved, jointed filament ; superior 

 antennae simple, without any pencil of filaments. 



