PLATE 2 



EXPLANATION OF FIGURES 



5. A later stage showing the two points of movement well separated. 



6, 7, and 8 show three successive stages in the formation of a new spindle. 

 9. Showing the division of the centrioles in the monaster egg. 



Fig. F Showing second polar body for motion in Limax campestris. After 

 Mark. 



Fig. G A first cleavage spindle in Cerebratulus. After Coe. 



520 



