400 THE DEVELOPMENT OF THE CHICK 
old. The germinal epithelium covers the surface and is continu- 
ous with the ovigerous strands projecting far into the stroma. 
The strands are broken up in the stroma into nests of cells; 
next the germinal epithelium are found characteristic primi- 
tive ova, but in deeper situations the primitive ova are larger 
and each is accompanied by a group of epithelial cells, which are 
distinctly differentiated as granulosa cells of young follicles in 
Car Li 7.) 
Fig. 230. — Cross-section of the ovary of a fledgling of Numenius ar- 
cuatus 3-4 days old. The germinal epithelium is below. (After 
Hoffmann. ) 
s. ¢., Sexual cords. 
the deepest. Thus the young follicles arise by separation of 
nests of cells from the ovigerous strands within the stroma; 
each nest includes a young ovocyte and a group of epithelial 
cells which arrange themselves in a single layer of cuboidal cells 
around the ovocyte. On each side of the free border of the ovary 
the embryonic state persists, and it is not known whether this 
