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 



Fig. 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 

 transformation of progerminative cell into an oocyte. (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- 



