SOUTH DAKOTA SCHOOL OF MINES 



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Figure 49 — Skull of the Titanothere Megacerops marshi. Osborn, 1902. 



it a Paleotherium. Later the true character of the specimen 

 was recognized, a new name was necessitated, and Titan- 

 otherium (Titanbeast) suggested by Dr. Leidy in 1852, 

 came into use. Since the finding of the earliest specimen 

 many species have been described. The following White 

 River phyla are now recognized: Menodus, Allops, Bront- 

 ops, Megacerops, Brontotherium. They are distinguished 

 from one another by differences in tooth and horn structure, 

 the shape of the head, and the relative length and massive- 

 ness of the limbs. They are all included under the general 

 term Titanotheres. Of these the Brontotheres were the lat- 

 est and the largest. 



Figure 50 — Skull of the Titanothere Brontotherium platyceras. 

 born, 1896. 



Os- 



Mr. Hatcher in 1886, while searching for Titanothere 

 remains in South Dakota and northwestern Nebraska, dis- 

 covered that certain forms of the skulls of the Titanotheres 



