GERM CELLS OF HERMAPHRODITES 201 
.@) 
m ©) SS SgF 
O 
O Sof 
O 
Oo 
Oc 
Sp 
Fic. 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 (mn); and still 
others odcytes (w). SgI = spermatogonium of first order; SgII = 
spermatogonium of second order; Sc = spermatocyte; St = sperma- 
tid; Sp =spermatozoa. (From Buresch, 1911.) 
