OF THE BATRACHIA. 117 



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

 would take the following order : — 



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



2. The Indian R 28 „ 19 



3. The African R 26 „ 19 



4. The North-American R. . . 23 „ 14 



5. The Australian R 23 „ 17 



6. The Europo-Asiatic R 22 „ 16 



168 



141 



108 



75 



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. 



Ranidce. 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 abundant in 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. 



Salammidridce. 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. 



CceciHidce. Tropical-American, African, and Indian Regions. 



Cystignatliidce. Tropical- American Region and Australian Sub- 

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

 Region. 



5. Families represented in 2 Regions. 



Dendrobatidce. Tropical-American Region and Madegasse Sub- 

 region. 



Dyscophidce. Madegasse Subregion and Indian Region. 

 Discoglossidce. Europo-Asiatic Region and New Zealand. 

 Amphiumidce. North- American Region and Asiatic Subregion. 

 Proteidce. North-American Region and European Subregion. 



