spg 



D 



Fig. 40. — Leptinotarsa decemlineata. Stages in cyst formation in testis. 

 A. Spermatogonia (spg), cells of terminal cap (^.c), and epithelial 

 cells (ep). B. Mitotic division of spermatogonium. C. Later stage 

 in same process. D. Binucleate spermatogonial cell within epithe- 

 lial envelope. E. Four spermatogonia connected by spindle re- 

 mains. F. Spermatogonia from cyst containing eight cells. 

 G. Section through cyst containing thirty-two spermatogonia. (127) 



