CENOZOIC TIME TERTIARY. 



907 



1531. 



single pair (often with rudiments of the other), in the Camel, Stag, Ox, etc. 

 Another Artiodactyl of the same horizon is the Eohyus distans of Marsh, 

 having Suilline or hog-like characteristics. 



The Bridger Eocene is remarkable for the remains of Dinocerata, animals 

 of Elephantine dimensions, having elongate canines, and two or three pairs of 

 bony prominences or horns on the head. Eig. 1530 represents the Tinoceras 

 ingens of Marsh, an animal 12 feet in length. They were successors to the 

 Coryphodons of the Wasatch. The prominences referred to are situated 

 severally on the snout, the cheeks, and the forehead. Marsh observes 

 that part, if not all of them, were horn-cores or bases of horns ; and that 

 those that were not so must have been covered with the hide, as in the Giraffe. 

 While thus armed to excess, and probably of great strength, the very small 

 brain shows that they were extremely low in intelligence. The earliest 

 species are : Tinoceras anceps of Marsh, described in October, 1872 (his 

 TitanotJierium anceps of 1871, found in 1870) ; Uintathermm robustum 

 of Leidy, August, 1872; and Tinoceras grandis and Dinoceras mirabilis 

 of Marsh, October, 1872. 

 Uintatherium Leidyanum 

 of Osborn (1878, 1881). has 

 very prominent horn-cores 

 and is from Dry Creek, 

 Wyoming. Uintatherium 

 has 36 teeth, Dinoceras 

 and Tinoceras 34. 



The Bridger beds have 

 afforded, among species 

 related to the Tapir, the 

 genus Helaletes of Marsh, 

 having the teeth 44 in 

 number and in contact, 

 which are prototypic char- 

 acters; also species of Hyrachyus and Paloeosyops of Leidy, which are es- 

 pecially common in the beds. Fig. 1531 is a restoration, by C. Earle, of 

 Palteosyops p)cily^dosiis of Leidy, an animal about six feet in length. 



There are also in the Bridger beds remains of Quadruniana, Creodonts, 

 and Bats, as well as Rodents and Insectivores. 



The Uinta group, the last division of the Eocene, has afforded new Tapir- 

 like species of the genus Diplacodon of Marsh, related to Paloeosyops of the 

 Bridger group and to the Titanotheres of the Miocene ; species of Amynodon 

 of Marsh, related to the Rhinoceros ; the EpiMppus gracilis of Marsh, an 

 early form of the Horse ; also the earliest of the Camel group, Leptotragidus 

 of Scott and Osborn; and of the Oreodonts, Protoreodon; a single genus of 

 Creodonts, besides many other kinds. 



The sea-border Jackson beds of Mississippi, Alabama, Georgia, and South 

 Carolina have afforded bones of two whale-like Mammals of the genus 



Eestoratlon of Palseosyops paludosus (x 5*5) by C. Earle. 1892. 



