A 



D 



Fig. 43, ^-£.— Differential dye reduction and differential susceptibility to cyanide in aster- 

 oid oocytes; arrows indicate direction of progress of reduction and cytolysis. A, B, maturation 

 stages, reduction progressing from apical pole {Paliria miniata; from Child, 1936a); C, /?, 

 differential cytolysis in ovarian oocyte of Asterias forbesii; E, differential cytolysis of both 

 nucleus and cytoplasm in Asterias oocyte (from Child, 19130). 



