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CHAP. XVII.] MAMMALIA. 211
Maryland to Florida ; and an extinct genus, Prorastomus, in some
Tertiary deposits in the Island of Jamaica.
In Post-pliocene deposits in Siberia, remains of Bytina have
been found ; while several species of the extinct genus HalU
therium, perhaps intermediate between Manatus and Halicore,
have been found in the older Pliocene and Upper Miocene of
France and Germany.
Order VII.— UNGULATA.
Family 43.—EQUID^. (1 Genus, 8 Species.)
Geneeal Distribution.
Neotropical Nearctic PaL/EARCTIC Ethiopian Oriental Australian
Sub-regions. Sub-hegions. Sub-regions. Sub-regions. Sob-reoions. Scb-reoions.
1.2 I
1.2.3-
Living Species.
-2.3- 1.2.3
[1.2.3.41
Extinct Species.
The Horses, Asses, and Zebras form a highly specialized group
now confined to the Ethiopian and Palsearctic regions, but during
the middle and later tertiaries having a very extensive range.
The zebras (3 species) inhabit the greater part of the Ethiopian
region, while the asses (4 species) are characteristic of the deserts
of the Palsearctic region from North Africa and Syria to Western
India, Mongolia, and Manchuria. The domestic horse is not
known in a wild state, but its remains are found in recent de-
posits from Britain to the Altai Mountains, so that its disappear-
ance is probably due to human agency.
Extinct Equidce.—Extinct forms of this family are very
numerous. The genus Eqims occurs in Post-pliocene and Plio-
cene deposits in Europe, North America, and South America.
In North America the species are most numerous. An allied
genus Hipparion, having rudimentary lateral toes, is represented