38 



STORY OF THE AMPHIBIANS 



hatch and come out again perfect frogs, having, how- 

 ever, been tadpoles a little while in the pits. Several 

 other frogs have sacs on the back in which the eggs 

 are hatched. A tree-frog of Dutch Guiana, and also 

 one of Trinidad, carrj their tadpoles around on their 

 backs, where the tadpoles cling by their peculiar suck- 

 ing disks (Fig. 19). 



The males of a great many frogs have a peculiar 

 habit. They take the strings of eggs and wind them 

 about their thighs. Some of these then go at once 

 into the water, while others sit in a burrow till the 

 eggs are ready to hatch and then go. Our spadefoot 



Fig. 20.— Axolotl {Amhhisioma tigrinum), tadpole state. 



toads are said sometimes to do this. A frog in the 

 Solomon Islands, which we have noted as laying its 



