Lilian V. Sampson 



499 



suppl}' and for organs of respiration adapted to a medium other than 

 water. 



In the viviparous salamander, the larva imbibes the fluid within the 

 uterus in which it swims. In terrestrial forms' of each order, the food 

 supply is given to the embryo in the enormous mass of yolk in the egg. 

 In spite of the large size of the egg, the type of cleavage in Hylodes is 

 holoblastic as in other Anura. The yolk-laden eggs of other forms have 

 scarcely been studied. The holoblastic type has been found to occur in 

 Alytes and in Desmognathus fusca (both formerly supposed to have 

 meroblastic eggs). 



As would be expected, the number of the eggs is comparatively small 

 in forms where the eggs are excessively large. The absence of pigment 

 is another peculiarity that has been noted in many cases where the eggs 

 are concealed, either carried by the parent or laid in sheltered situations. 

 The following table summarizes the observations, so far as they have 

 been made: 



"A case of unpigmented eggs laid in small pools; these eggs are not long 

 exposed, for they hatch eighteen to twenty-four hours after the beginning 

 of segmentation. 



