GEOLOGICAL SURVEY OF THE TERRITORIES. 355 



Many remains, consisting of fragments of jaws, teeth, and articular ends 

 Sfferent bones of the skeleton, collected by Messrs Meek, Hayden 

 and Evans, indicate a nearer alliance of the animal to the companion of 

 the Palceothere, that is to say, the Anoplothere. 



The remains of the species, named m honor ot its discoverer, Dr. Prout, 

 belong to the lowest beds of the miocene deposits of the mauvaises terres, 

 according to the authority of Professor Hayden. 



The teeth of Pront's Titanothere formed nearly unbroken rows, though 

 not so completely as in the Anopothere. It appears to have possessed 

 an incisor less on each side than in the latter, and its canines were pro- 

 portionately larger, differences which induced small breaks or intervals 

 in the dental series. Among living animals, the grinding teeth of 

 the Titanothere approached most nearly in appearance those of the rhi- 

 noceros In the best preserved specimen of the jaws of Titanothere the 

 series of teeth measure nearly a foot and a half in length. 



Various fragments of the skeletons of different individuals indicate 

 considerable variation in size, probably due to difference in sex. 



Dr John Evans reported the discovery of the skeleton of an individ- 

 ual imbedded in the rock in the mauvaises terres, which measured, in 

 position, about eighteen feet in length and nine feet m height. This 

 appears much too large in proportion to the size of the jaws above 

 referred to, and the measurement is probably greatly exaggerated, it it, 

 perhaps, does not apply to some other and larger animal The speci- 

 mens upon which the species T. Prouti is established indicate an animal 

 intermediate in size to the Indian rhinoceros and the elephant. 



PAL^OSYOPS. 



This extinct genus is indicated by some remains obtained during Pro- 

 fessor Hayden's last expedition. The specimens consisting ot small 

 fragments of jaws, with molar teeth, were found at Church Buttes, and 

 on Henry's Fork of Green Eiver, Wyoming. The remains belong to the 

 Bridger Group of tertiary rocks, probably of miocene age. The genus 

 is closely allied to TitanotJierium of the mauvmses terres, and to bhal- 

 icotlierium of the Sevalik Hills of India. . . ' 



Palceosyops paludosus.— The only species of the genus approximated in 

 size the common ox. 



Anthracotheridw. 



This name has been given to an extinct family of even-toed pachy- 

 derms whose types are the genera Anthracotherium and Chwropotamus, 

 of the early and medial tertiary formations of Europe. It is also rep- 

 resented in the miocene tertiary formation of the mauvmses terres ol 

 White Eiver by the remains of a genus which had been previously 

 recognized as occurring in England and France. 



HYOPOTAMUS. 



This eenus was established by Professor Owen from some remains 

 found in the eocene deposit of the Isle of Wight. The true molar teeth, 

 or grinders, resemble those of ruminating animals, except that the upper 

 ones present the remarkable character of an additional or fifth lobe 

 introduced between the anterior pair of lobes. The whole number ot 

 teeth and the kind correspond with those of the existing hog. 



Eyopotamus Amcricanus.—A species based upon fragments of jaws and 



