88 J. M. ESSENBERG. 



PLATE VI. 



FIG. 30. Transverse section of testis in early stage of tubule formation. 

 X 1000. 



FIG. 31. Transverse section of testis in middle stage of tubule formation. 

 X 1000. 



FIG. 32. Transverse section of testis in late stage of tubule formation (early 

 phase). X 1000. 



Symbols : 



ee External epithelium of gonad. 



m Mesentery. 



inch Mesorchium. 



nt Nest of primordial germ cells. 



p Peritoneum. 



f>c Peritoneal cells. 



pgc Primordial germ cells. 



re Red blood cell. 



sc Sex cords. 



