220 



THE WORLD OF LIFE 



CHAP. 



obtained from our London Clay. It had a heavy body, 

 five -toed stumpy feet, and a complete set of 22 teeth 

 in each jaw adapted for a vegetable diet ; but no defensive 

 tusks or horns. Other allied species were much smaller, 

 and all were remarkable for a very small brain. 



But a little later, in the Middle Eocene of North 

 America, they developed into the most wonderful monsters 

 that have ever lived upon the earth — the Dinocerata or 



FlG. 73. — UlNTATHERIUM INGENS. 

 Eocene of Wyoming, U.S.A. One-thirtieth nat. size. (B.M. Guide.) 



" terrible-horned " beasts. These had greatly increased in 

 size ; they often had large tusks in the upper jaw ; and horns 

 of varied forms and sizes were developed on their heads. 

 The tusks were sometimes protected by a bony flange pro- 

 jecting downwards from the lower jaw immediately behind 

 it, as well shown in the figure here given of Uintatherium 

 ingens. This animal must have been about 1 1 feet long 

 and nearly 7 feet high ; and if the six protuberances of the 

 skull carried horns like our rhinoceroses, it must, indeed, 

 have been a " terrible " beast. The imperfect skull of 

 another species (Fig. 74) shows even larger the bony horn- 

 cores presenting all the appearance of having carried some 



