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214 GEOGRAPHICAL ZOOLOGY. [part IV.<br />

only. The hornless Accrotherium is Miocene only, in both<br />

countries. Other genera are, Leptodon from Greece, and Hyra-<br />

codon from Nebraska, both of Miocene age. More than 20<br />

species of extinct rhinoceroses are known, and one has even been<br />

found at an altitude of 16,000 feet in Thibet.<br />

Family 46.—HIPPOPOTAMID^. (1 Genus, 2 Species.)<br />

Neotropical<br />

Sub-regions.<br />

Nearctic<br />

sub-begioks.<br />

General Distribution.<br />

Pal,earctic<br />

Sob-regions.<br />

Living Species.<br />

Ethiopian I Oriental<br />

Sub-regions. Sub-regions.<br />

1 .2.3 —<br />

Extinct Species.<br />

1.2 1<br />

Australian<br />

Sub-regions.<br />

The Hippopotamus inhabits all the great rivers of Africa ; a<br />

distinct species of a smaller size being found on the west coast,<br />

and on some of the rivers flowing into Lake Tchad.<br />

Fossil Hipijopotami.—Eight extinct species of Hippopotamus<br />

are known from Europe and India, the former Post-pliocene or<br />

Pliocene, the latter of Upper Miocene age. They ranged as far<br />

north as the Thames valley. An extinct genus from the Siwalik<br />

Hills, Merycopotamus, according to Dr. Falconer connects Hippo-<br />

potamus with Anthracotherium, an extinct form from the Miocene<br />

of Europe, allied to the swine.<br />

Family 47.—SUID^. (5 Genera, 22 Species.)<br />

>

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