DINOCERATA. 569 



Restoration. — As in all the species of Uintatheriutn in which the horns 

 are known, these appendages stood in front of the orbits, it is probable 

 that such was the case in the Eobasileus furcatus also. The muzzle is mate- 

 rially shorter and more contracted, and the true apex of the muzzle was 

 not overhung by the great cornices seen in LoxoJophodon cornutiis. The 

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

 in the L cornutiis, so that in life the snout and muzzle had not such a pre- 

 ponderance of proportion as in that species. All the species of this genus 

 were rather rhinocerotic in the proportions of the head, although the liorns 

 and tusks produced a very different physiognomy. Tlie extremities of the 

 nasal bones are strongly pitted and exostosed, and this, taken in connection 

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

 sessed a proboscis of less or greater length. 



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



papei', which was published and distributed August 19, 1872, under the 



generic name Loxolophodon. I shortly afterward referred it to tlie new genus 



Eobasileus. 



LOXOLOPHODON Cope. 



Proceed. Amer. Philos. Soc, If-TS, p. C80, extra copies published August 19th, aud p. 488 (August 22d). 

 AuDual Report U. S. Geol. Surv. Terrs., ld"2 (1S73), p. 565. f Tinoceras, Marsh, American Jour- 

 nal of Science aud Arts, 187'2 (October), published September yist. 



The cranium in this genus is elongated and compressed. The muzzle 

 is posteriorly roof-shaped, but is anteriorly concave and flattened out into 

 a bilobed protuberance which rises above the extremity of the nasal bone. 

 This extremity is subconic and short and decurved. A second pair of horn- 

 cores stands above the orbits, each one composed externally of the maxil- 

 lary bone, aud internally of an upward extension of the posterior part of 

 the nasal. Behind this horn the superior margin of the temporal fossa 

 sinks, but rises again at its posterior portion, ascending above the level of 

 the middle of the parietal bones. This portion of the skull is injured in 

 my onl]^ specimen. The occipital rises in a wall upwards from the foramen 

 magnum, and supports, probably, a little in front of the junction with the 

 superior and inferior ridges bounding the temporal fossa, a third horn -core 

 on each side. The base of this core is as stout as that above the orbit, and 

 subround in section. The temporal fossa has its principal extent poste- 



