Fig. 22 A 



SC 



DL 



B p Fig-. 24 A. 



FIGS. 22^-25*. The four small figures represent t 

 the formation and shifting of the blastopore (BP). T 

 through its horizontal axis YZ, and represent four stag 

 of the egg through more than 90. 



DL, dorsal lip of blastopore ; 1C, intermediate cells 

 VL. ventral lip of blastopore ; wx, axis of embryo, w 

 YZ. axis of embryo, which is at first horizontal and sui 



