CCELENTERATA. 



145 



ally see it, is a compouad animal, in which the number 

 of oscula represents the fused units. This compound 

 animal may be composed of successive buds branch- 

 ing off from the original stock, or of several stocks, 

 originally distinct, which have touched and fused ; 



Kg. 23i.. ^ ^'^- 2S=- 



Fig 28a., — Amcebiform cell from tUe parenchyma of Spojipitla; highly 

 magnified. 



Pip. 2iB.— A ynung Sponge, S^cmi. : 0, osculum ; p, poi-e. (From Glaus and 

 Sedgwick, iif ter Fr. K. Sohulze.) 



and usually the growth of a sponge consists of a mix- 

 ture of both processes. 



The formation of the larva of the sponge is not 

 observed to be the same in different kinds of sponge, 

 but differs widely ; and while, on the whole, it s.eems 

 probable that the structure of the body is to be inter- 



