LIFE HISTORY OF TWO RARE CILIATES 



391 



indicates a reduced nuclear volume. On the other hand, cells 

 with a ratio very close to the kernplasma-norm were abundant 

 during periods of reduced division energy. The variations 

 noted in Spathidiuni are seen by consultation of table 5, to be 

 also true for Actinobolus. These facts therefore, seem to indi- 

 cate that the kernplasma-relation is not a constant quantity 

 and bears no definite relation to the division-rate. In spite 

 of the wide departure from the kernplasma-norm shown in the 

 vagetative cells recorded in table 2, this divergence, resulting 

 in a disturbed kernplasma-relation has not resulted in division 

 of the cell. It seems therefore that division in Spathidium 



TABLE 5 

 Vegetative-cells of Actinobolus radians 



Average kern-plasma relation = 1:20. 



