Heredity in Protozoa 



613 



This structure underwent other partial fissions, giving the irreg- 

 ular monster shown in Fig. 15, d. This lived for about four days, 



then disintegrated. 



4 Instances of the fourth category, in which no' divisions 

 occurred, are given by aq^ (Fig. 16, a) and am'^'^'^ (Fig- 16, b). 



Fig. 15 History of the race derived from the irregular individual aq. See text. 



These both lived for five days without dividing or taking food; 

 both then disintegrated. 



The mass ar was the result of partial fission, so that it included 

 several partial individuals. As successive partial fissions occurred 



