OF THE ALIMENTARY TRACT 21 



cytoplasm is separated evenly for the two individ- 

 uals. 



In the case of multiplication within cysts, which 

 occurs in some of these species, the mitotic division 

 of nucleus and nuclei proceeds to the production of 

 the number characteristically formed, although some- 

 times multiples of the usual number are seen, before 

 division of cytoplasm takes place. In some the com- 

 pletion of the process does not occur until excysta- 

 tion, when the smaller offspring, corresponding to 

 the number of nuclei, are liberated. 



