a 5* ORDER VIL Cancer. 



Armed with fpines on the upper 

 part ; Or 



With an uneven furface. 



2. Macrouri, or long tailed crabs : thefe 

 are fubdivided from the following 

 circumftances : 



Thofe having a fmooth thorax ; 



Thofe with an uneven or tubercu- 

 lated thorax •, 



Thofe which have the thorax armed 

 with fpines ; 



Thofe in which the hand is without 

 fingers, and the thorax of an ob- 

 long form ; 



Thofe in which the (hell of the tho- 

 rax is fhorter than that part, which 

 it does not cover entirely. 



Some fpecies of each of thefe families are 

 parajitici j thefe, for the moft part, live in 

 the (hells of other teftaceous animals, and 

 their tails want the leaves, or plates, which 

 terminate the tails of the other crabs. 



The 



