GEOLOGICAL SURVEY OF THE TERRITORIES. 579 



The portiou of ulna just measured belougs to the individual of which 

 so many fragments were fonnd, or l^o. 2. 



The dorsal vertcbrw of the same are somewhat distorted by pressure; 

 1 will therefore describe a cervical of natural form. The centrum is very 

 short, and the articuhir iace is a wide, transverse oval. Both are slightly 

 concave, and the axis 'being slightly oblique, the anterior is the more 

 elevated. The surface of the latter is qnite rugose, except on the mar- 

 gins. The cervical canal is wide, and the neurapophyses and para- 

 pophyses narrow. Inferior surface regulaily convex. 



Measurements of cervical vertebra. 



M. 



Length centrum , 044 



Length basis ueurapophysis 040 



Length anterior articular face 102 



Depth anterior articular face ' 08* > 



Width neural canal at base 060 



Relations. — Besides the difference in the development of the anterior 

 nasal tuberosities, which might be sexual only, this si)ecies differs from 

 L. cornutvs in the simple nasomaxillary horn-cores, which want the 

 interior tuberosity of that species, and in the fact that they are com- 

 posed exclusively on their inner sides of the nasal bones to the apex, 

 the maxillaries forming the outer face. U. pressicornis has also a much 

 wider and less massive supraoccipital basin, with lighter horn-cores, 

 if present. Minor differences have been already mentioned. 



The measurements given by Marsh for his TUanotlierium {?) anceps 

 (later Tinoceras anceps) are considerably smaller than those of corre- 

 sponding parts of EohasUeiis pressicornis, but represent more nearly a 

 species of the size of Uinfatherium robustum. When the species is suffi- 

 ciently described, we shall be able to determine to which of the genera 

 it should properly be referred. 



Restoration. — The elevation of this animsil was not much less than 

 that of the Loxolophodon cornutus.^ but the proportions were more slender; 

 as in all the species of Uintatherium in which the horns are known, 

 these appcTidages stood in front of the orbits, and nearer the nareal open- 

 ing than in the type of the former genus. The muzzle, too, is materially 

 shorter and more contracted, and the true apex of the muzzle was not 

 overhung by the great cornices seen in Loxolophodon. The horn-sheaths 

 were probably simple, while in L. cornutus they were probably palmate. 

 The occipital and parietal crests are much more extended in this species 

 than in the L. cornutus, so that in life the snout and muzzle had not such 

 a preponderance of proportion as in that species. All the species of this 

 genus were rather more rhinocerotic in the proportions of the head, 

 although the horns and tusks produced a very different physiognomy. 

 The extremities of the nasal bones, though not excavated as in that 

 species, are strongly pitted and exostosed, and this, taken in connection 

 with the elevation of the head, renders it probable that this species also 

 possessed a proboscis. 



History. — This species was originally described by the writer in a short 

 paper, w^hiph was published and distributed August 19, 187U, under the 

 generic name Loxolophodon. I shortly afterward referred it to the new 

 genus LobasileuSj under the name cornutus, under the impression that it 

 was the same as the Loxolophodon cornutus; but finding this was not the 

 case, I again used the specific name here adopted. 



