THE CRABS. 



273 



animals the abdomen is short, flattened, and apt to escape 

 immediate notice, as it is habitually kept closely applied 

 against the under surface of the cephalothorax. It is 



Fig. 72. Cancer pagvrus:,ma\e (J nat. size\ A, dorsal view, with the 

 abdomen extended ; B, front view of " face." as, antennary sternum ; 

 ot; orbit ; r, rostrum ; 1. eyestalk ; 2. antennule ; 3. base of antenna ; 

 3', free portion of antenna. 

 ]3 



