506 



CENOZOIC TIME. 



family, among the species of which some of Elotherium were as large 

 as a Rhinoceros ; Rhinoceroses (of the genera Rhinoceros, Hyraco- 

 don, Aceratherium, Diceratherium), the molars of one species as in Fig. 

 919, from Leidy. There were also kinds between the Tapir and Di- 



Tceth of Ilyracodon (Rhinoceros) Nebrascensis. 



noceras group, one of them of the genus Menodus ( Titanotherium) was 

 as large as an Elephant ; a single tooth half the natural size is repre- 

 sented in Fig. 920. Another kind called Brontotherium by Marsh 

 had a pair of horns and was of no less magnitude. As in the Tapirs, 

 it had four toes in front, three behind. (Plate IX.) 



Fig-. 920. 



Tooth of Titanotherium Proutii (X>£). 



The even-toed Ungulates embraced new Ruminants, the Oreodonts, 

 called by Leidy " ruminating hogs," a skull of one of which is repre- 

 sented in Fig. 921, and other kinds more like Stags {Leptomeryx) and 

 Camels (Poebrotherium, Protomeryx). The Fauna comprised also 

 Carnivores represented by species of Wolves (Cariis, Amphicyon), the 

 first of the species of Machcerodus, a lion with long sabre-shaped ca- 

 nines, species of Hycenodon, the largest equaling in size the Black Bear, 

 and several Insectivores ; and among Rodents, the earliest of American 

 Beavers (Palazocastor Nebrascensis Leidy), besides other species. 



The Mammals of the Marine Miocene of the Atlantic coast are 

 mainly species of Whales, Dolphins, Seals, and Walruses, bones of 

 which have been found at Gay Head on Martha's Vineyard and else- 

 where ; but also, of Rhinoceros, Lophiodon, Elotherium, from the New 

 Jersey beds, and of Camelus from those of Virginia. 



