PROTOPLASMIC MOVEMENT. 



83 



Fig. 



Fig. 



Figs. 9 and :o.-Entire eggs of C. plana ; third cleavage. Sphere substance of second cleavage 

 at central and upper angles of cells. Initial direction of the spindles not uniforl! ^ 



preceding cleavage. The protoplasmic area increases with the 

 breaking of the nuclear membrane, and the spindles do not 

 occupy similar positions in the four cells but are often dexio- 



