590 THE BRIDGEE EPOCH. 



riorly with a regular curve. Its extremity is broken off in the specimen, 

 but the deep alveoli of two incisors remain on each side. The form of 

 these shows that the roots of the incisor teeth ai-e much compressed. A 

 small mental foramen issues below the middle of the second or posterior 

 one. 



This symphysis is a good deal more compressed than that of Loxo- 

 lophodon cornutus, as described by Messrs. Scott, Spier, and Osborne, but 

 has the same general character. 



I have given tiie following more detailed description of this specimen in 

 the Proceedings of the Philadelphia Academy for 1882, p. 295. I had pre- 

 viously mentioned it in the Annual Report of the Hayden Survey for 1872, 

 p. 565. 



The presence of but two teeth on each side of the symphysis is an im- 

 portant peculiarity, since the other species so far as described, are said to 

 have four teeth on each side of the symphysis, viz: three incisors and one 

 canine. Those present in the present species I suppose to be incisors. 

 The molar teeth are so much like those of Uintatherium robustum, that I be- 

 lieve the specimen to belong to that species. 



Symphysis very much compressed, so that the incisor teeth of oppo- 

 site sides are close together; its inferior outline curved upwards to the alve- 

 olar edge, in an obtuse keel. Base of flange for superior canine distinct, 

 commencing below the posterior edge of the posterior alveolus, and imme- 

 diately preceded by a mental foramen. Middle line of symphysis rugose. 

 Ramus at last molar robust, owing to the prominence of the inferior part of 

 the anterior masseteric ridge. In adaptation to the oblique position of 

 the head, the inferior molars are oblique to the long axis of the ramus, slop- 

 ing upwards and backwards, with exposed anterior roots. The molars in- 

 crease in size posteriorly, and the last one is abruptly larger than the penul- 

 timate. Their structure is as in U. robustum, i. e., with an obliquely trans- 

 verse high crest in front, and a low posterior transverse edge of the heel, 

 and a short oblique crest between the two. The last named is short, and is 

 directed obliquely outwards and forwards towards the external exti-emity of 

 the anterior crest, but disappears before reaching it. The internal extrem- 

 ity of this and the low posterior crest, with the external extremity of the 



