574 THE BEIDGER EPOCH. 



LOXOLOPHODON CORNUTUS Cope. 



Loxolophodon cornutus Cope. Proceed. Amer. Philos. Soc, 1872, p. 580 (August 19); 1. c, 1872, p. 483 

 (August 22). EobasileuB cornutus Cope, Amer. Nat., 1872, p. 774. Annual Report U. S. Geol. 

 Surv. Terrs., F. V. Hayden, 1872 (1873) p. 568, Plates I-IV. ?f Tinoceras grandia Marsh, Amer, 

 Joum. of Sci. and Arts, October, 1872 (published September 2l),/de Marsh. 



Plates sxxvii to xlii. 



Established on the remains of a single individual, which consist of a 

 nearly perfect cranium, the right scapula complete, several vertebrae, includ- 

 ing the sacral, the first or second rib, the pelvis complete, and the entire 

 right femur ; also probably the proximal end of a radius. 



The species is remarkable for the narrow form of the cranium, its width 

 at the middle being one-fourth its length. A little in front of the middle 

 are situated the horn-cores. These diverge, the upper portion having an 

 outward curvature The base of each is triangular, with obtuse angles in 

 section, and the inner angle is the section of a rib-like projection which 

 commences half way up the horncore and extends across the middle line to 

 its fellow. Above its rather abrupt termination the core is transversely com- 

 pressed, with oval obtuse apex. The core measures M. .240 (9.5 inches) 

 from its base in front, M. .108 (4.25 inches) in width at the base behind, 

 and .077 (3 inches) in diameter at the apex. A slight swelling of the sides 

 of the muzzle descends obliquely forward from the base of each horn, 

 which enlarges below into a jjrominent rib, which incloses the alveolus of 

 the canine tusk. In front of the horns the muzzle is roof-like ; anteriorly 

 it flattens out, and swells a little above the posterior end of the nasal 

 meatus. In front of this it expands again, and rises gently to the extremity 

 of the bilobed nasal shovel, which overhangs the premaxillaries, the nasal 

 meatus, and the greater part of the apex of the nasal bones. The latter 

 is short and with a wide base, and resembles two lateral cones flattened 

 together, their extremities obliquely truncate outward and excavated. In 

 the nasal bones of the Eohasileus furcatus Cope, the shovel is represented by 

 a tubercle only on the side of a continuous surface. The composition of 

 the upper surface of the cranium is somewhat difficult to determine, 

 owing to the injured state of the posterior part. If we regard the bone 

 which bounds the lachrymal behind and above, as frontal, as I did in 

 originally describing the species, it gives an extraordinary extent to the 



