580 GEOLOGICAL SURVEY OF THE TERRITORIES. 



EOBASILEUS FURCATUS, Oope. 



Loxolopliodon hifurcahis, Cope, in extra, copies on Proboscidians of the Eocene of Wyo- 

 ming, August 19, IST^."* Loxolophodon furoatus in the same, Proceedings American 

 Philosophical Society, 1872, p. 580, separata, Aug. 20. L. c. 488, August 22. 



This species was originally described from a large horn-core whose ex- 

 tremital part resembles strongly the nasal shovel of J^obasileus comutus, 

 on which account I referred it to that position on the skull. Marsh has 

 described somewhat similar horn-cores from the lateral crests of the 

 skull behind in U. mirahile, whence it may be that my specimen is 

 referable to that position, although it differs much from those of that 

 species. 



The basis is very narrow and lenticular ; a short distance above it the 

 outer side is convex. The anterior and posterior extensions of the base 

 differ ; the one is thinner, the other more massive and with a shallow 

 groove above its comm'encemeut. The latter may be posterior. If so, 

 the compressed apex of the horn-core sends down a rib outwardly to the 

 anterior and one inwardly, which disappears on the convex base. The 

 general form is spatulate wit>h the apex expanded obliquely across the 

 lateral crest, and regularly rounded in superior outline. Its anterior 

 fai e is flat, the posterior convex; its surface is grooved by very small 

 blood-vessels. 



As compared with the posterior horn-core of Loxolophodon cornutus, 

 there is every difference. That is continuous with one margin of the 

 crest, this erect above it ; that has a round base, this a lenticular one. 

 It is more like that of U. mirahile, which I only know from Marsh's fig- 

 ure, but abundantly distinct. It is much more elongate, especially above 

 the (?) posterior part of the crest, and is flattened, and without the trian- 

 gular section of that species. 



Measurements of horn-core. 



M. 



The total length above crest, (5, 5 inches) 0. 135 



The total length above base, (7J inches) 180 



Width across apex, (in front) 095 



Th ickness across apex, (in front) 028 



Thickness at base 040 



It is not certain that this horn may not belong to the JS. pressicornis, 

 if it be a posterior core, of which, however, I am not yet sure. In that 

 case the name^ fitrcaiits, under which it was first described, becomes a 

 synonym of IJ. pressicorni^. 



UINTATHEEIUM, Leidy. 



Proceedings Academy Natural Sciences, Philadelphia, 1872, p. 169, (published August 

 Ist. ) Vintamastix, Leidy, loc. cit., Dinoceras, Marsh, Amer. Journ. Sci. Arts, 1872. Octo- 

 ber, 1872, (pabiished September 27.) 



This genus resembles the last in its general proportions, but differs in 

 its more elongate cervical vertebrae. The centra of these are flat at both 

 extremities, but have not such a marked elephantine ahibreviatiou as 

 seen in the two genera above described. This enabled the head to 

 approach the ground more nearly, and as the limbs were shorter in 

 some of the species, they no doubt modified the length of the proboscis, 

 if present. 



Several names have been applied to this genus. Professor Leidy's 

 name, liere employed, bears date early in August. Under date of Sep- 

 tember 27th, Professor Marsh proposed the name Dinoceras (American 

 Journal Science Arts, 1872) for the U. mirahile, but did not give his 



*See Proceedings American Philosophical Society, 1872, p. 515, where this name is 

 recorded. 



