3 4 THOMAS H. MONTGOMERY. 



PLATE III. 



FIGS. 26-30. Primary rodlet abstricting from the rod. early Sertoli cells. 

 FIG. 31. Trinucleate ultimate spermatogonium. 

 FIGS 32, 33. Early Sertoli cells with primary rodlets. 

 FIGS. 34-36. Secondary stages of Sertoli cells. 



