n 



CUJ 



FIG. 24. A PLANT OF A SINGLE CELL (Sphcerella pluvialis). 



In the upper left-hand corner are seen the plants in the motile stage. To the right one more highly magnified 

 and showing the cell-wall (etc), protoplasm (p), nucleus (n), and flagella (/), arising from the clear part of the 

 protoplasm and piercing the cell-wall. Below to the left is a plant that has passed into the still condition : and 

 beside it one that has divided into four within the cell-wall. 



11 



