PLATE 2 



EXPLANATION OF FIGURES 



14 Cell of germinal epithelium, 'protobroque.' 16 mm. embryo. Herm., 

 I.H. 



15 Primitive oocyte in the epithelium. Transition from protobroque to 

 leptotene. Same ovary as 14. 



16 Primitive oocyte in leptotene stage. Two nucleoli are visible. 14 mm. 

 embryo. P.A.F., I.H. 



17 Beginning of synizesis, primitive 'oocyte. 17 mm. embryo. Carnoy's 

 I.H. 



18 Synizesis, primitive oocyte. 16 mm. embryo. Fl.,Tn. 



19 Pachytene stage, primitive oocyte. 19 mm. embryo. Herm., I.H. 



20 Diplotene stage, primitive oocyte. Embryo near term. Herm., I.H. 



21 Primitive oocyte, ti'ansition from diplotene to dictyate (dictye). Same 

 ovary as figure 20. 



22 Dictyate stage. Primitive oocyte in follicle of a single layer of flattened 

 cells. The idiosome is visible. Mouse three days p.p. Fl., Tri. 



23 Dictyate stage. The nucleus only of a primitive oocyte in a follicle of 

 4 or more layers of cells, with a cavity (antrmn) just forming. Thirteen days p.p. 

 Fl. Tri. 



24 Cell of the germinal epithelium, resembling 'protobroque' stage. Twenty- 

 eight days p.p. Fl.,Tri. 



25, 26, 27 Cells of the germinal epithelium in mitosis. Mouse eleven days 

 p.p. P.A.F., I.H. 



308 



