

Wenrich. — Spermatogenesis of Phrynotettix magnus. 



PLATE 2. 



Figs. 14-20. — Prophases of early spermatogonia. 



Figs. 14a, 14b. — Two successive sections of the same cell in earUest prophase. 



Figs. 15a, 15b. — Two sections of a single cell in early prophase. Formation 



of fine spiral thread. 

 Fig. 16. — Polar view of later prophase. Fine spiral threads, all distinct. 



Composite granules prominent. 

 Fig. 17. — Side view of later prophase. Accessory in vesicle. Longitudinal 



epUt beginning to appear in threads. 

 Fig. 18. — Section from distal pole of nucleus. Vesicular walls persisting. 

 Fig. 19. — Later prophase. Composite granules breaking up into polar 



granules. 

 Fig. 20. — Later prophase. Accessory still in vesicle. 

 Figs. 21, 22. — Side view and optical section, respectively, of telophase of last 



spermatogonial division. 

 Figs. 23, 24. — Oblique side view and optical section, respectively, of early 



preleptotene stage. 



