260 EXTINCT MONSTERS 



Marsh for so liberally devoting his time and his private resources 

 in order to advance the science of Palaeontology. 



In the country east of the Rocky Mountains, including the 

 states of Dakota, Nebraska, Wyoming, and part of Colorado, 

 Professor Marsh has discovered the remains of yet another 

 strange group of large quadrupeds. The best known of these is 

 Brontops, of which the skeleton is seen in Fig. 97. These animals 

 lived after the Dinocerata, namely, in the Miocene period, and 



FIG. 97. Skeleton of Brontops robustus. (After Marsh.) 



were the largest American mammals of that period. They 

 constitute a distinct family more nearly allied to the rhinoceros 

 than to any other living form. The skeleton on which Fig. 97 

 is founded was the most complete of any yet discovered by 

 Professor Marsh. Portions of it were exhumed at different times, 

 but it was first found in 1874. Our artist has made the restora- 

 tion seen in Plate XLII. from this skeleton, as figured by Professor 

 Marsh. 



This strange group of creatures flourished in great numbers on 



