Cancer. A P T E R A. 253 



Genus X. Cancer, the Crab-. 

 Linn. Syft. Nat. page 1038. 



The Crab has eight feet (fometimes ten 

 or fix) beiides two hands terminated by the 

 claws. 



It has two moveable eyes, generally 

 projecting from the head, or placed upon a 

 kind of ftalk. 



It has two palpi armed with claws. 



The tail is articulated, and unarmed, or 

 without any kind of fting. 



This genus is divided into families, as 

 follows : 



I . The Brachyuri, or Jhort tailed crabs > in 

 which the thorax is either 



Smooth, and the fides of it entire ; 



Smooth, with the fides jagged or in- 

 dented ; 



Hairy, or fpinous on the upper part; 



Armed 



