122 THE AMERICAN MUSEUM JOURNAL 
of South Dakota, and were discovered by J. W. Gidley, H. F. Wells and 
the American Museum expedition of 1894. 
(4) A skeleton of the Three-toed Forest Horse, Hypohippus, from 
the Middie Miocene of Coiorado, collected by Barnum Brown of the 
American Museum expedition of 1901. This is not a direct ancestor of 
the modern horse, but is a nearly related type, adapted to a forest country. 
(5) A skeleton of the Three-toed Desert Horse Neohipparion from 
the Upper Miocene of South Dakota, obtained by H. F. Wells of the 
American Museum expedition of 1902. ‘This very perfect skeleton rep- 
resents the last stage of development of the three-toed horses before the 
side toes disappeared. 
(6) A skeleton of the true native American Horse, Equus Scotti, 
extinct since the Pleistocene Epoch. ‘This fine skeleton was found in 
Texas by J. W. Gidley of the American Museum expedition of 1899. 
It is very much like the domesticated horse and equals it in size, but has 
in certain respects the proportions of a zebra. Wild horses were un- 
known in America when discovered by white men, though they had 
formerly been abundant. Why they became extinct no one knows. 
The Museum Expedition of last summer (1908) in Western Nebraska 
obtained a large and interesting coliection of Three-toed Horses. ‘The 
most important find was a bone bed containing thousands of jaws, teeth 
and fragments, principally of horses, but also including a great variety 
of other animals, some fifty or sixty species in all. ‘These appear to be 
of Pliocene age, representing an intermediate stage, hitherto very little 
known in this country, between the Three-toed Horses of the Miocene 
and the One-toed Horses of the Pleistocene. It is hoped that further 
work in this interesting deposit will bring to light more complete speci- 
mens. Several incomplete skeletons of ‘Three-toed Horses from the 
Middle and Lower Miocene formations of Western Nebraska were also 
secured, besides a fine series of skeletons and other remains of camels, 
rhinoceroses and other forms. 
One feature of the American Museum Fossil Horse collections of 
especial value to scientists is that it includes practically all the type speci- 
mens from which the various species have been described, either the 
original specimens or carefully executed plaster casts. It is intended to 
make this series absolutely complete, so that students desiring to compare 
or identify specimens will find here everything that has been described, 
and by consulting the library, can find out all that has been said about it. 
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