III.] THE COMMON FROG. 29 



genera Kaloida of India, and BracJiynieriis of South 

 Africa. 



The female of a peculiar American Tree-Frog 

 (^Nototrema marsiLpiatimi) has a pouch extending 

 over the whole of the back and opening posteriorly. 



Fig. 10.— The female of Noiotrama marsicf>iatjim, with ihe pouch paitly cut open 

 (after Giinther). 



Into this the eggs are introduced for shelter and 

 protection. A dorsal pouch also exists in the allied 

 American genus, Opisthodelphys. An American spe- 

 cies of Hylodes has the habit of layino- its eees in 

 trees singly in the axils of leaves, and the only 

 water they can obtain is the drop or two which 

 may from time to time be there retained. 



A still m.ore remarkable mode of protecting the 

 &<gg is developed by the Great Toad of tropical 

 America {Pipa americand). In this case the skin 



