198 THE INFANCY OF ANIMALS 



of carrying the eggs upon the back. In the species just 

 reviewed it will be remembered we started with Goeldi's 

 frog, wherein, for the further safety of the eggs, a low 

 parapet of skin encircles the mass : from this we found the 

 walls of the parapet growing upwards and inwards, to arch 

 over and enclose the eggs, finally ending in the evolution 

 of a pouch. 



SURINAM TOAD. 



In the Surinam toad the skin responds in a different 

 manner, since it swells up around each egg, so that each, 

 to the num!ber of a hundred or more, is enclosed in a 

 separate cell, or pit, and covered with a lid ! In due 

 course the larvae develop, and passing through the long- 

 tailed tadpole stage while still within the egg, finally 

 emerge as perfectly developed toads in miniature, not even 

 the stump of a tail being left. 



