PLATE 6 



EXPLAXATIOX OF FIGURES 



14 Later stage of atretic follicle (X 40). Only a few yolk spheres remain in 

 cavity. Cavity is practically filled with lutear cells. 



15 Part of figure 14 at greater magnification (X 176), showing lutear cells in 

 theca interna {i), as well as the central cavity. 



28 



