OP THE BATRACHIA. 117 



"With, regard to the number of genera and species, the six regions 

 would take the following order : — 



1. The Tropical- American R. . . 58 genera, 48 peculiar to R. ; 375 species. 



2. The Indian R 28 „ 19 „ 168 „ 



3. The African R 26 „ 19 „ 141 „ 



4. The North-American R. . . 23 „ 14 „ 108 „ 



5. The Australian R 23 „ 17 „ 75 „ 



6. The Eiuopo- Asiatic R 22 „ 16 „ 60 „ 



There exists great diversity with respect to the extent to which 

 the several families have been dispersed over the globe, as may be 

 seen from the following arrangement : — 



1. Families represented in the 6 Regions. 



Bufonidce. Cosmopolitan, except Madagascar, New Guinea, and 

 New Zealand. 



JtanidcB. Most abundant in the Indian and African Regions, few 

 in the Tropical-American Region, absent from the Australian and 

 New-Zealand Subregions. 



2. Families represented in 5 Regions. 



Hylidce. Very numerous in the Tropical- American Region; 

 numerous in the Australian and North- American Regions ; two 

 species in the northernmost parts of the Indian, and one throughout 

 the Europo-Asiatic Region. 



Engystomatidce. Nearly equally abundantin the Tropical-American, 

 Indian, and African Regions ; several forms in the Austro-Malayan 

 Subregion, and one species in the Southern parts of North America. 



3. Families represented in 4 Regions. 



Pelohatidce. Europo-Asiatic, North- American, and Indian Regions, 

 and Austro-Malayan Subregion. 



Salamandridoe. Very abundant in the North-American and 

 Europo-Asiatic Regions; few in the Tropical- American Region; 

 two species in the Northern parts of the Indian Region. 



4. Families represented in 3 Regions. 



C(eciliid(e. Tropical-American, African, and Indian Regions. 



Cystignathidce. Tropical-American Region and Australian Sub- 

 region ; one species in the Southern parts of the North-American 

 Region. 



5. Families represented in 2 Regions. 



Dendrohatidce. Tropical-American Region and Madegasse Sub- 

 region. 



Dyscophidoe. Madegasse Subregion and Indian Region. 

 Discoglossidce. Europo-Asiatic Region and New Zealand. 

 Amphiumidce. North-American Region and Asiatic Subregion. 

 Froteidce. North-American Region and European Subregion. 



