ONTOGENY IN CILIATES 87 



The cortex is certainly very important, not only because 

 we have considered the surface of ciliates. And the con- 

 clusion that there is something in common in the ontogeny 

 of ciliates and the differentiation of metazoan cells during 

 development, namely, the organization of the cortex, seems, 

 for the time being, quite reasonable. 



