16 THE COLLECTION OF FOSSIL VERTEBRATES 
became extinct. The Titanotheres occupy the first of the 
three main alcoves into which the south side of the hall is 
divided. 
The second alcove is devoted to the RHINOCEROSES, which 
con — 
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Ow Rie 
RESTORATION OF TITANOTHERIUM, AN EXTINCT HOOFED MAMMAL OF WESTERN AMERICA 
The picture shows a bull, a cow and a calf 
From the original water-color, based on mounted skeleton and skulls in American Museum 
of Natural History 
were very common beasts in North America as well as in the Old 
Sci World during the Tertiary period. They also began in 
Alcove 2, the Eocene as small hornless animals (Hyrachyus, Case 
Rhinoce- 7), but diverged in the Oligocene into cursorial, aquatic 
ROBES? and true (terrestrial) Rhinoceroses of which the two 
former soon became extinct. True Rhinoceroses also became ex- 
tinct in America by the Pliocene epoch, while in the Old World 
several of them have survived to the present day. 
Third Alcove. Horses.? This fine exhibit is due chiefly to 
t For more detailed information regarding the evolution of the Horse, see 
Guide Leaflet No. 7, ‘' The Evolution of the Horse.”’ Published January, 1903. 
