Michigan Academy of ?!cience, 



Seventeenth Annual Report. 

 Plate V. 



A. Livinfj; e^gs of Cryptobranchus allegheniensis dissected from the ovary, 

 and showing the germinal" vesicle at the surface. Ovarian membranes containing 

 blood-vessels wholly or partially cover the eggs. X 4. 



B. Vertical section through the germinal vesicle of an egg in the stage shown in 

 the preceding figure. X 60. nu., nucleoli; y. i., yolk islands. 



