2f6 



ZOOLOGY. 



larger species, inhabiting warm climates : they are viviparous-, 

 and change their skins iu the manner of Spiders. 



10. Cancer. Crab. Legs eight, sometimes six or ten ; 

 besides two chelated hands ^ eyes two, distant, gene- 

 rally pedunculated, elongated, and moveable; tail 

 jointed, unarmed. 



This genus is divided into Crabs, having a roundish flatt- 

 ened body : JLobsters, with the body elongated ; tail move- 

 able ; chelate claws, two, flattened, furnished with a move- 

 able thumb : Cray-Fish, with an elongated spinous body, 

 tail moveable, chelate claws four-sided. These animals feed 

 on all kinds of animal substances either fresh or putrid ; they 

 annually change their shells. 



11. Monoculus, i^o-^ four or eight, very long, formed for 

 swmiming ; body covered by a crustaceous tegument ; 

 eyes in most species approximated, and imbedded in 

 the shell. 



Most of this genus are small aquatic insects, scarcely dis- 

 coverable but with the microscope, some few are large, and 

 the largest of the Insect tribe, is found in this genus, the M, 

 Polyphemus^ which has been known to measure two feet in 

 length, exclusive of the tail ; in those species, said to possess 

 only one eye, (from whence the generic name,) the two eyes 

 are so approximated, as to appear single. Food as the last. 



1% Oniscus. Wood-Louse. J<2Z4Jj truncate 5 cmtennce setn.^ 

 ceous ; body oyal ; le^s fourteen. 



