Oope.] 54 [Feb. 21, 



about 1000 feet, in the Mammoth Buttes, on South Bitter Creek. As 

 the basin of Bitter Creek is 7,500 feet above the sea, the fossil was taken 

 from an elevation of 8,500 feet. The horizon is the Bridger Group of 

 the Eocene of Hayden. 



EOBASILEUS. Cope. 



Proceedings of the American Philosophical Society, 1872, p. 485 (Ex- 

 tra copies published by the author, August 20th). 



As pointed out above, this genus resembles Loxolophodon in the very 

 short cervical vertebrae, but agrees with Uintatherium in the rudimental 

 condition of the nasal horn-cores, which are mere tubercles. The posterior 

 or third pair of horn-cores are also very different, and probably stand on 

 the largely developed lateral crests of the superior surface of the cranium, 

 as in Uintatherium. They are apparently preserved in E. furcatum 

 (which is not the type of the genus), and are compressed from base to 

 summit ; in Loxolophodon the base is nearly cylindric. 



The characters of this genus had not been indicated in any of the de- 

 scriptions published by palaeontologists prior to its establishment as above 

 cited. It is possible that Tinoceras grandis of Marsh may be synony- 

 mous with one of the species here referred to it, but this point cannot be 

 determined from the descriptions of that author. 



The cervical vertebra in E. pressicornis are very short. The limbs are 

 much as in Loxolophodon, as are the scapula and pelvis. The symphysis 

 pubis of E. pressicornis, or an ally, is short, and was separated from the 

 ischiadic symphysis, but whether this belongs to the genus is not entirely 

 certain. 



The navicular bone, of perhaps the same species as the above, displays. 

 as in living proboscidians, four inferior facets, thus proving the existence 

 of five toes to the hind foot. The external facet is deeply concave, and 

 contains a pit. It is oblique, and unites with the superior face by an 

 acute angle. It supported the small inner toe by its metatarsus directly. 

 The other three are more nearly on one plane, and are deeper than wide. 

 The navicular is in form a little less than a quarter of a circle, and the 

 external (anterior) depth is one half its transverse length. Its superior 

 surface is slightly convex. 



EOBASILEUS PRESSICORNIS. Cope. 



Loxolophodon pressicornis, Cope. Proceed. Amer. Philos. Soc, 1872, 

 p. 580 (published by the author, August 19th). Loc. cit., p. 488 (August 

 22). Eobasileus cornutus, Cope, 1. c, p. 485 (Aug. 20th), not Loxolopho- 

 don cornutus, Cope, 1. c, Aug. 19. 



Represented by numerous portions of the cranium, with fragments of 

 limbs of one individual ; of almost all portions of the skeleton except the 

 cranium, of a second. A humerus with astragalus of a third are of un- 

 certain reference, while a single humerus of another species may belong 

 here. Fragments of several other individuals of appropriate size may 

 pertain to it. 



