Plate II. 



Fig. 13. Rather regular five-cell stage from above. 



Fig. 14. Rather regular six-cell stage from above. 



Fig. 15. Same egg as shown in Fig. 14, but from below, showing the extent 

 of the first cleavage plane. 



Fig. 16. Eight-cell stage from above. 



Fig. f7. Same egg as Fig. 16 but from below, showing extent of first cleav- 

 age plane. 



Fig. 18. Rather regular eight-cell stage from the side. 



Fig. 19. About a sixteen-cell stage from above. 



Fig. 20. Same egg as Fig. 19, lat'er stage. 



Fig. 21. Few-cell blastula from above. 



Fig. 22. Same egg as Fig. 21, from the side. 



Fig. 23. Same egg as Fig. 21 from below, showing some of the first seg- 

 mentation planes meeting below. 



Fig. 24. Many cell blastula from above. 



