580 GEOLOGICAL SURVEY OF THE TERRITORIES. 



EOBASILEUS FURCATUS, Cope. 



Loxolophodon hifurcatits, Cope, in extra copies on Pioboacidians of the Eocene of Wyo- 

 ming;, Aujriist 19, 1872." Loxolophodon furcatus in tlie same. Proceerlings Ameri^sau 

 Pliilosophical Society, 187"2, p. 580, separata, An<f. 20. L. c. 488, Angust 22. 



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

 treinital part resembles strongly the nasal shovel of JSobasileuscormitus, 

 on which account 1 referred it to that position on the sknll. Marsh has 

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

 skull behind in U. mirahilc, 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 commencement. 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 with the apex expanded obliquely across the 

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

 fa' 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. mirabile, which I only know from Marsh's fig- 

 ure, but abundantly distinct. It is n)uch more elongate, especially above 

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

 gular section of that species. 



Measurements of horn-core. 



M. 



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



Tlie total length above base, (7^ inches) 180 



Width across apex, (in front) 095 



Thickness aci'oss apex, (in front) 028 



Til ickuess at base 040 



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

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

 case the name /?rr6'«f«/.s, under which it was first described, becomes a 

 synonym of E. pressicornis. 



UINTATHERIUM, Leidy. 



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

 Ist.) Vintamafitix, Lvidy, loc. cit., Dinoceras, Marsh, Amer. Journ. Sci. Arts, 1872. Octo- 

 ber, 1872, (published September 27.) 



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

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

 extremities, but have not such a marked elephantine abbreviation 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, xhew no doubt modified the length of th.e proboscis, 

 if present. 



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

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

 tember liTth, Professor Marsh proposed the name Dinoceras (American 

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



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

 recorded. 



