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

by several species in the Pliocene of North. America, while in<br />

Europe it occurs both in the Older Pliocene and Upper Miocene.<br />

Various other allied forms, in which the lateral toes are more<br />

and more developed, and most of which are now classed in a dis-<br />

tinct family, Anchitheridse, range back through the Miocene to<br />

the Eocene period, A sufficient account of these has already<br />

been given in vol. i. chap. vi. p. 135, to which the reader is<br />

referred for the supposed origin and migrations of the horse.<br />

Neotropical<br />

Sdb-reqions.<br />

Family 44.—TAPIPJD^. (2 Genera ? 6 Species.)<br />

General Distribution.

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