FERTILIZATION BY EXOGAMY 



151 



of maturity manifesting themselves in other ways than by size changes. 

 In other cases the conjugating cells are reduced in size, but without 

 differences of a sexual character, and in still other cases there is a 



C 



FIG. 64 





Ameba diploidea, Hartmann and Niigler. A and B, ordinary individuals at early and 

 mid-phases of division; C, D, E, union of two individuals within cyst, and fusion of the 

 double nuclei in each cell; F, ameba after fusion of cell bodies, now with two nuclei, creep- 

 ing out of cyst. 



