GERM CELLS OF HERMAPHRODITES 197 
native cell loses its affinity for nuclear dyes; the 
chromatin masses become less numerous and more 
nearly spherical; and the entire cell increases in size, 
the nucleus growing much more than the cytoplasm. 
These progerminative male cells divide mitotically 
E F 
Fie. 57.— Helix pomatia. Stages in differentiation of male and female 
sex cells from indifferent cells. A. Epithelial indifferent cell. 
E. Progerminative indifferent cell. B-D. Stages in transformation 
of progerminative cell into a spermatogonium. F-G. Stages in 
oni aaa of progerminative cell into an odcyte. (From Ancel, 
1903. 
and then pass into the lumen of the acinus, where 
they may be recognized as spermatogonia of the 
first order. 
After the spermatogonia have passed into the 
lumen of the acinus the wall is seen to consist of two 
groups of cells; those of one group are central and in 
contact with the spermatogonia, the others are periph- 
