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- 



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 



