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These he names, Hipparion, Protohippus, Merychippus, Hypohippus, and Parahippus. Professor Oliver, on the other hand, after showing how many of the American types found fossil in Europe are common to Japan, inclines to the theory, first advanced by Dr.
From Hipparion some of the authorities believe that the zebras may have been developed. Miohippus, Protohippus, and Hypohippus, varying in size from that of a sheep to that of a donkey, are other branches of this spreading family. In the Pliocene period the evolution of the main stem culminates in the appearance of the horse, and the collateral branches are destroyed.
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