364 



BERTRAM G. SMITH 



Fig. 2 Diagrams showing the direction of first cleavage in forty-eight eggs 

 of Cryptobranchus allegheniensis in which an attempt was made to control the 

 direction of entrance of the spermatozoon. The eggs are shown in polar view; the 

 seminal fluid was applied to the edge of the germinal disc on the right-hand side 

 of the egg. 



