388 THOMAS H. MONTGOMERY. 



PLATE V. 



FIGS. 44-47. Later stages of Sertoli cells, Figs, 44 and 47 being oblique trans- 

 sections. 



FIGS. 48, 49. Degenerate nuclei of late Sertoli cells. 



FIG. 50. Portion of a section of a seminiferous tubule. Uppermost is the wall 

 of the tubule, and next to it a layer of ultimate spermatogonia. The syncytium 

 of the Sertoli cells is expressed by dark shading, and thrir nuclei an- ili-.iin^ui-liahlt 1 

 by their angular form and central chromatic body. The other cells shown are 

 chiefly early spermatids. 



