506 



CENOZOIC TIME. 



genus, Hipparion, which had three toes (Fig. 920 c), but the two outer 

 too small to reach the ground. With these there were also true 

 Horses, of the modern genus Equus. 



The American Later Eocene era had also, in the Fort Bridger 

 region, etc., its Carnivores, related in characters to the Cat, "Wolf, and 

 Fox. The still higher group of Quadrumanes (Monkeys) was repre- 

 sented, according to Marsh, by species related to the Lemurs and 

 Marmosets. There were also Bats, Squirrels, Moles (Insectivores), and 

 Marsupials. 



Miocene Tertiary quadrupeds abound in the Upper Missouri region 

 about White River, and in different localities about the summit of the- 



Fig. 923. 



Tooth of Xitanotlieriutu i'ruutii (X'a)- 



Rocky Mountains, and also in the interior of Oregon. The White 

 River beds were early explored by Evans and Hayden. Leidy has de- 

 scribed from this region, among Carnivores, kinds related somewhat 

 to the Hyena, Wolf, Tiger, and Panther; among Herbivores, two 

 Rhinoceroses, and species approaching the Tapir, Hog or Peccary, 

 Camel, Lama, Horse, Deer, and Musk-ox ; several Rodents related to 

 the Hare, Beaver, Squirrel, etc. ; and a number of Insectivores. 



Teeth of Hyraeodon (Rhinoceros) Nebrascensis. 



The Titanothere (Titanotherium Proutii L.) is one of the Herbi- 

 vores, having some relations to the modern Tapir and ancient Pale- 

 othere, but, according to Marsh, nearer to the ancient Dinocerata, as it 

 had at least one pair of horns. One of the teeth is represented, half 

 natural size, in Fig. 923. The animal was twice as large as a modern 



