FORAMINIFERA. 



381 



variety. In the higher orders of plants and animals the 

 specific forms are more definite, there being a more com- 

 plex organization, harmonizing with the special habits of 

 each creature ; and the individuals of each species are less 



Fig. 209. Foraminifera taken in Deep-sea Sounding*. (Atlantic.) 



numerous than is the case in the Protozoans and Proto- 

 phytes." 



These lowly organized Foraminifera, having great 

 simplicity of structure, more easily adapt themselves to 

 varying external conditions than the more complex and 

 specialized higher animals. 



