GERM CELLS OF HERMAPHRODITES 201 



Fig. 59. — Helix arhustorum. Diagram showing row of gorminal cijitho- 

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

 into lumen of germ gland; others beconu' 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. {Fro7H Buresch, 1011.) 



