CATXIANAS3A SUBTERRANEA. 



217 



DEC APOD A. 



MACROURA. 



THALASSINAD^. 



Callianassa subterranea. Leach. 



Specific Character. Moveable finger of the larger claw, thick, obtuse ; wrist 

 and hand smooth. 



Cancer (Asfctcus) subterranciis, 

 Callianassa subtermma, 



MONT. Trans. Lin. Soc. IX. t. iii. f. 1, 2, p. 89. 

 LEACH, Edinb. Encycl. VII. p. 400. ED. 



Trans. Lin. Soc. XI, p. 341. Malac. Brit. 



t. xxii. EDW. Hist. Nat. Crust. II. p. 309. 



THE carapace is much flattened at the sides, rounded 

 above, very smooth ; the rostrum minute. The eyes 

 very small. The external antennae with a long peduncle : 

 the terminal and antecedent joints nearly cylindrical ; the 

 basal joint pyramidal. The internal antennre have the 

 peduncle as long as the terminal portion, which is double. 

 The external pedipalps are rather broad, pediform ; the 

 terminal joint acute, curved. The first pair of feet very 

 unequal : the larger, which is sometimes the left, some- 

 times the right, is very large, flattened, polished, ciliated 

 on the edges ; the arm is furnished, on the inner side 



