EMBRYOLOGY OF CRYPTOBRANCHUS 



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ovc. 



13 



14 



15 



16 



Figs. 13 to 16 Cross-sections through the wall of the ovary of a 9 cm. larva of 

 Cryptobranchus allegheniensis. X 300. b. v., blood vessel; c. w., cyst wall; 

 ep. (right) , inner epithelial membrane of the ovarian wall ; ep. (left) , outer epithelial 

 membrane of the ovarian wall;ep. c, epithelial cell of the cyst; foL, follicle cell; 

 ovc, ovocyte. 



Fig. 13 A cyst containing young ovocytes and epithelial cells occupies the 

 central part of the figure. 



Fig. 14 A cyst containing slightly older ovocytes. 



Fig. 15 An ovocyte surrounded by the nevdy-formed follicle. 



Fig. 16 An ovocyte and follicle slightly more advanced than the one shown in 

 preceding figure. 



