FIG. I. Lateral view. The cleavage cells form a small group 

 at the anterior end of the egg. The polar protoplasm (PP) 

 is evident as a deep staining disk. 



FIG. II. Lateral view. The cleavage cells have increase' 

 in number and form a conical figure. 





FIG. III. Lateral view. The cleavage cells have further 

 increased in number, and the conical figure formed by them 

 has increased in size, so that in the anterior half of the egg the 

 cleavage cells lie on the surface of the egg and are here beginning 

 to form blastoderm. 



