CANCERIDJG. 



161 



inserted below the eyes and inner antennae; last 

 joint of fifth feet, broad, ovate, pointed. 



P. variegatus. Fig. 307 ; \ n. s. 



Carcinus (Leach). Carapace four-sided, the 

 front margin wide and arched, strongly toothed ; 

 the hind margin narrowed ; fifth feet compressed, 

 their last joint thin, but narrow and pointed. 



C. Meenas. Pig. 308 ;.*. 



FAMILY VII. CANCERID.E. 



Pirimela (Leach). Carapace nearly as long as 

 broad, convex, with strongly marked ridges, front 

 margin strongly toothed. 



P. denticulata. Fig. 309 ; n. s. 



