Cyclopidius (Pitliecistes) Cope, etc. -^09 



Max. width of brain-case 41 



Width above P- 31 



AVidth between middle of orbits 37 



Depth of malar below middle of orbits 15 



Depth of paramastoid below inferior border of auditory 



meatus 29 



Ant.-post. diam. of bulla 23.5 



Transverse diam. of bulla 22.1 



Eamus, depth, coronoid to angle 60 



Depth below M, 23 



Total length from incisor border 92 



]VP plus M-, length 24 



Superior premolar series, length 28 



Ml plus M2, length 23 



Inferior premolar series, with P-^, length 27 



Leptauchenia major Leidy 1856. 



This species is represented in the Marsh Collection 

 at Yale by a very well preserved skull with, jaws, Cat. No. 

 10118, Y. P. M., as well as by other more or less fragmen- 

 tary material, yielding data which have heretofore been 

 undescribed. 



Specific Characters. — The skull is intermediate in size 

 between that of Oreodon culbertsonii and 0. gracilis. The 

 upper skull contour shows a steep forward declivity from 

 the junction of the temporal ridges to the tip of the nasal 

 bones, which lies above the line of the canines. The 

 infra-orbital foramen is above the posterior part of P^. 

 The nasals are very narrow ; the forehead is slightly ele- 

 vated in the median plane and somewhat concave between 

 that and the supra-orbital margins. The skull is 

 depressed, especially in advance of the orbits. The 

 temporal ridges diverge much more rapidly and widely 

 than in Oreodon. The facial vacuities are large and 

 extend posteriorly nearly to a line through the middle 

 of the orbits. The muzzle is marked by a prominent ridge 

 from the infra-orbital arch to the anterior end of the 

 nasals. The palate is nearly flat. The bullae are very 

 much inflated and extend somewhat forward of the glenoid 

 articular surface. The paroccipitals are broad, but 

 tapering posteriorly and ending slightly below the infe- 

 rior border of the bullae. The latter are rather more 

 roughly triangular, than oval, in outline, with the base 

 posteriorly located. 



The rami resemble those of Oreodon more closely than 



