Il8 HARRIET RANDOLPH. 



Explanation of Plate II. 



Figs. i8 and 19. Late anaphase stages. 

 Fig. 20. Telophase; ?m, the "mitosoma" of Zweiger. 

 Fig. 21. Second spermatocyte, prophase. 

 Fig. 22. Second spermatocyte, metaphase. 

 Fig. 23. Second spermatocyte, equatorial plate. 

 Figs. 24 and 25. Second spermatocyte, anaphase stages. 



Figs. 26, 27, 28, 29. Spermatids, showing archoplasma (rt) in different stages, 

 and the movement of the centrosome. 



Fig. 30. Somatic cell of female, equatorial plate. 



Fig. 31. Ovum, equatorial plate. 



Fig. 32. Young spermatozoa containing condensed chromatin. 



