PLATE 1 



EXPLANATION OF FIGURES 



53 Cryptobranchus allegheniensis. Living eggs dissected from the ovary, 

 showing the germinal vesicle at the surface. The small spots within the germinal 

 vesicle are probably nucleoli. Ovarian membranes containing blood-vessels 

 wholly or partially cover the eggs. X 4. 



54 Cryptobranchus allegheniensis. Unfertilized eggs with their gelatinous 

 envelopes, after two days' immersion in water. Natural size. 



154 



