THE EA B Til WORM 



177 



Echiurus/ is segmented when young like Nereis, but eventually 

 it loses its segmentation (Fig. 167). 



Possibly allied to the Gephyrea is the group of Bryoz'oa,^ 

 or moss-animals. These are noteworthy from the fact that 



Fig. 168. — Pedicellina americana, an endoproctous bryozoan. A colony, 

 magnified 15 diams. Photo, of living animals by W. H. C. P. 



thej^ are compound, many individuals budding off from one 

 another, as in plants. They are found abundantly both in 

 the sea and in fresh water. There are two main groups, the 

 End'oprocta (Fig. 1G8), in which the individual consists of a 



^ echls, adder ; oura, tail. 

 N 



'^bruon, moss ; zoon, animal. 



