GERM CELLS OP HERMAPHRODITES 201 

 O 



Fig. 59. — Helix arbustorum. Diagram showing row of germinal epithe- 

 lial cells some of which, as at m, become spermatogonia and drop 

 into lumen of germ gland ; others become nurse cells (n) ; and still 

 others oocytes (w). Sgl = spermatogonium of first order; Sgll = 

 spermatogonium of second order ; Sc = spermatocyte ; St = sperma- 

 tid ; Sp — spermatozoa. (From Buresch, 1911.) 



