128 CEUSTACEA. 



abdomen of four segments ; antennae not two- 

 branched ; eye in male stalked. 



A. Patersonii. Fig. 215 ; £. 



Family IV. Cetochilim. 



Cetochilus (Vauzeme). 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 ; -J. 



TEIBE II. OSTEACODA. 



Two eyes ; two pairs of feet Cypridinadce. 



One eye ; three pairs of feet Cytheridce. 



Family I. Cypridinamj. 



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. 

 brencla. Marise. 



Family II. Cytheeid^e. 



Cy there (Mull.). 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. 



