422 
GEOGRAPHICAL ZOOLOGY, 
[part IV. 
The Pipidse are toads without a tongue or maxillary teeth, and 
with enormously dilated sacrum. The only species of Pipa is a 
native of Guiana. 
Family 22.— DACTYLETHRTO®. (1 Genus, 2 Species.) 
General Distribution. 
Neotropical 
Sub-regions. 
Ne ARCTIC 
Sub-regions. 
PaLjEARCTIC 
Sub-regions. 
Ethiopian 
Sub-regions. 
Oriental 
Sub-regions. 
Australian 
Sub-regions. 
1 . 2.3 - 
— 
The Dactylethridoe are Toads with maxillary teeth but no 
tongue, and with enormously dilated sacrum. The species of 
Dactylethra are natives of West, East, and South Africa. 
General Remarks on the Distribution of the Amphibia. 
The Amphibia, as here enumerated, consist of 22 families, 
152 genera, and nearly 700 species. Many of the families have a 
very limited range, only two (Ranidae and Polypedatidae) being 
nearly universal ; five more extend each into five regions, while, 
no less than thirteen of the families are confined to one, two, or 
three regions each. By far the richest region is the Neotropical, 
possessing 16 families (four of them peculiar) and about 50 
peculiar or very characteristic genera. Next comes the Austra- 
lian, with 11 families (one of which is peculiar) and 16 pecu- 
liar genera. The Nearctic region has no less than 9 of the 
families (two of them peculiar to it) and 15 peculiar genera, 
13 of which are tailed Batrachians which have here their 
metropolis. The other three regions have 9 families each; 
the Palse arctic has no peculiar family but no less than 15 
peculiar genera ; the Ethiopian 1 family and 12 genera peculiar 
to it ; and the Oriental, 19 genera but no family confined to it. 
It is evident, therefore, that each of the regions is well 
characterised by its peculiar forms of Amphibia, there being 
only a few genera, such as Hyla, Rana, and Bufo which have a 
wide range. The connection of the Australian and Neotropical 
