THE CRABS. 



273 



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

 immediate notice, as it is habitually kept closely applied 

 against the mider surface of the cephalothorax. It is 



Fig. 72. Cancer 2>ogi!r')!s,iwQ\e {\ rat. size\ A, dorsal vieAv, witli the 

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

 or, orbit : r. rostrum ; 1. eyestalk ; 2. antennule ; 3a base of antenna , 

 3 , free portion of antenna. 



