﻿CLASSES AND SUB-KINGDOMS. 



187 



worms, leeches, certain sea- worms, etc.). Animals whose 

 bodies are made up of an indefinite number of segments, 

 bearing appendages which are not jointed, and in the larger 

 number of groups having bunches of bristles or setoe upon 

 the sides of the body which act as supplementary organs of 

 locomotion. The name annelida is derived from the Latin 

 word annulus, a ring. 



WOE.-iS. 



" Stjb-Kingdom Yertebrata, with the following classes, 

 which have been only briefly alluded to : Fishes, AiiijpMhians^ 

 Be^tiles, Birds, Mammals. According to a late classifica- 

 tion of Professor Huxley's, these classes would stand Ichthy- 

 ojysida, which includes the Fishes and Amphibians; Sa^i- 



