PLATE I. 



Fig. 1. Strepsinema stage of a giant spermatocyte. 



Figs. 2-6. Strepsinema stages. 



Figs. 7-12. Late prophases of first maturation division. 



Fig. 13. Polar view of chromosomal plate of first maturation division, condition A; the allo- 

 somes at a different level from the other chromosomes. 



Figs. 14-17. Lateral views of first maturation division, condition A. Fig. 14 shows all 12 

 chromosomes. 



Fig. 18. First maturation division, condition B. 



Figs. 19-22. First maturation division, condition C; all the chromosomes shown in figs. 19, 21. 



Fig. 23. First maturation division, condition D. 



Figs. 24, 25. Oblique lateral views of first maturation division, condition E. 



