Classification of Marsh 1874
G. †Anchitherium von Meyer 1844
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†Anchitherium anceps Marsh 1874
†Anchitherium celer Marsh 1874
G. †Orohippus Marsh 1872
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†Orohippus agilis Marsh 1873
†Orohippus gracilis Marsh 1871
†Orohippus major Marsh 1874
†Orohippus pumilus Marsh 1871
G. †Pliohippus Marsh 1874
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†Pliohippus pernix Marsh 1874
†Pliohippus robustus Marsh 1874
G. †Protohippus Leidy 1858
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†Protohippus avus Marsh 1874
†Protohippus parvulus Marsh 1868