HORSE EXHIBIT 127 
Among the notable specimens in the series of ancestors of the horse 
are 
(1) The earliest Four-toed Horse, Kohippus, from the collection of 
the late Professor E. D. Cope, purchased by the Museum in 1894. ‘This 
unique specimen was found in a Lower Eocene formation of Wyoming 
in 1880 by J. L. Wortman and has long been well known to scientists. 
(2) A second later stage of the Four-toed Horse, Orohippus, repre- 
SYSONBY AT FULL SPEED. 
From model prepared by E. 8S. Christman. 
sented by the oniy skeieton ever discovered. ‘This was found by Walter 
Granger of the American Museum expedition of 1905 in southwestern 
Wyoming. It is but little larger than the Kohippus, but it shows a cer- 
tain advance toward the horse type especially in the teeth and feet. 
(3) Three compiete skeletons of the early ‘Three-toed Horses, Meso- 
hippus, showing successive increase in size, and a further advance 
toward the horse type in ail details of structure; this is especially notice- 
able in the teeth and feet. ‘These skeletons are from the Big Bad Lands 
