490 



H. L. Wieman. 





• " 0. « 



••V- 





Fig. 6 Section through the distal end of the pupal testis showing continuity be- 

 tween the cells of the terminal cap and those of the degenerating region. X 265. 



Fig. 7 Complete transverse section of a pupal testis, e.c, terminal cap; s.d., 

 sperm duct; c, cysts of germ cells; d, degenerating cells; ex., central cavity of the 

 testis continuous with that of the sperm duct; sp, spermatogonia not grouped into 

 cysts. 



Fig. 8 Longitudinal section of the distal region of the testis of an imago. 

 ex., terminal cap of epithelial cells; sp, spermatogonia; e./n., membrane of flattened 

 epithelial cells enclosing the degenerated area, d, degenerated cells. X265. 



Fig. 9 Iransverse section through the distal region of the testis of an imago. 

 X255. 



