610 
J. BRONTE GATENBY. 
Fig. 20. — Later stage. Archoplasm ( A.B .) and Nebenkern rodlets of 
fairly rare type. Usual sort is shown in PI. 32, fig. 23, and appears, 
later. Z. Zone of cytoplasmic activity which has spread around the- 
nucleus. x 4250, C. 
PLATE 32. 
Fig. 21. — Bouquet stage of generation drawn in the two preceding- 
figures. M. Mitochondria. X 4250, C. 
Fig. 22. — Second maturation division showing probable Nebenkern 
rods ( X.N.K .) in cytoplasm mixed with mitochondria, x 4250, C. 
Fig. 23. — Later stage, showing appearance of Nebenkern ( N.K .) and 
dispersal of mitochondria ; at X. the cell is losing its place on the 
germinal epithelium. X 4250, C. (Compare Text-fig. 4, i.) 
Fig. 24. — Secondary spermatogonium showing Nebenkern (N.K.) and 
mitochondria, x 4250, F.W.A. 
Fig. 24 A. — Spermatid with ring-like Nebenkern (N.K.) and large mito- 
chondria. x 4250, F.W.A. 
Fig. 25. — Spermatocyte near end of growth showing Nebenkern with 
many curved rods. X 4250, C. 
Fig. 26. — Spermatid with largish mitochondria and small curved 
batonettes in Nebenkern. Nucleus has large number of nucleolL 
X 4250, C. (For P.N.A. see Addendum A.) 
Fig. 27. — Spermatocyte in prophases. Ring-like Nebenkern rods 
scattered somewhat haphazardly. At X., X., region of centrosomes. 
X 4250, F.W.A. 
Fig. 28. — Spermatogonial division with seed-like chromosomes^ 
X.N.K. Probable Nebenkern. x 4250, F.W.A. 
Fig. 29. — Spermatogonium (secondary) with Nebenkern (N.K.). 
x 4250, F.W.A. 
PLATE 33. 
(All F.W.A. x 4250.) 
Fig. 30.— Bouquet stage, showing loops radiating towards Nebenkern. 
Rather small example. 
Fig. 31. — Growth stage of spermatocyte. Mitochondria dispersing. 
Nebenkern at NK. 
Fig. 32. — Near end of growth period. Nebenkern rods banana- 
shaped. Between thirty and forty in number. 
