114 



THE DARWINIAN THEORY 



organism, which consists of a hollow ball formed 

 by a single layer of flagellate cells like monads. 

 (Fig. 21.) 



It must be noted that these examples do not form 



Fig. 21. 



C 4 



B 



Adult organisms resembling early embryonic stages in higher t animals. 

 A, Monad; B, Pandorina; C, Salinella ; D, Volvox. 



a continuous series in the sense of being derived 

 from one another. They are mentioned merely 

 with the object of showing that the very earliest 

 stages of development, like the later ones, may be 

 recapitulatory ; and that these early larval stages 



