File:The American Museum journal (c1900-(1918)) (17536814964).jpg

Title: The American Museum journal
Identifier: americanmuseumjo03amer (find matches)
Year: c1900-(1918) (c190s)
Authors: American Museum of Natural History
Subjects: Natural history
Publisher: New York : American Museum of Natural History
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: Biodiversity Heritage Library

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EVOLUTION OF THE HORSE 15 and these are just beginning to show signs of fusing into cross- crests. The premolar teeth have only one main cusp, except the third and fourth premolars (next the molars) in each jaw, which have two and three, respectively. The only specimens which have been found were in the London Clay or Lower Eocene of England and are preserved in the British Museum. The Eoliippiis is much better known. It comes from the Lower Eocene of Wyoming and Xew Mexico, and is very like the Hy-
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<S^ ^^ FIO. 1.—UPPER AND LOWER TEETH OF " EOHIPPUS," FROM THE LOWER EOCENE OF WYOMING. NATURAL SIZE racotherium except that the molar teeth have the cusps more clearly fusing into cross-crests, and the last premolar is begin- ning to look like one of the true molars. The forefoot of this animal has four complete toes and the splint of a fifth. The hindfoot has three complete toes and the splint of another. A specimen of the hindfoot is shown in the series in the A-case and many incomplete specimens, skulls, jaws etc., of several species in the counter-case. 3 and 4. Protorohippus and Orohippus. Middle Eocene. In these animals tlie si)lint of the first digit in the forefoot and tlie splint of tlie fiftli digit of tlie hindfoot have disappeared, but there are still four complete toes in the fore- and three in the hind- foot. The crests on the molars are a little clearer and the last premolar has become almost like the molars, while the next to the last premolar is beginning to become so. A skeleton of Protorohippus is mounted in the wall-case. It shows an animal of the size of a small dog, and projiortioncd much like the breed known as the icliippei, of which a skeleton has been placed near by for comparison with the Protorohippus skeleton. The Protoro- hippus was found by Dr. J. L. Wortman in 1880 in the Wind

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