236 



THE PROTOZOA 



In Actinosphcerium, Hertwig describes a process which may be summa- 

 rized as follows : after most of the nuclei are absorbed in the cyto- 



^f% 



plasm, the " mother-cyst" divides into as many parts (primary cysts) as 

 there are nuclei remaining. In small animals the entire mass may form 

 one primary cyst with one nucleus, but large specimens may have 



