145 

 Genus LXXXIL CANCER, 



GENERIC CHARACTER. 



Eyes two, moveable, generally pedunculated, 

 or placed on footstalks projecting from the 

 head. Legs eight, sometimes six or ten, 

 besides two with claws. Palpi six, unequal. 

 Tail jointed and unarmed. 



General Observations, 



Linnaeus has divided the Crabs into the fol 

 lowing families : 



1. Brachyuri, or short-tailed crabs. 



a. Thorax smooth, with the sides entire. 



/S. smooth, with the sides indented. 



y. hairy, or spinous on the upper 



part. 



§. with spines only, 



s. : with an uneven surface. 



£. Macrouri, or long-tailed crabs. 



a. Thorax smooth. 



j3. — _ uneven, or tuberculated. 



y. __ spinous. 

 VOL. II. O 



