1873.] UO [Cope. 



comutus, and less recurved. The mastoid process is quite prominent. 

 The humerus has a prominent internal condyloid ridge and tuberosity, 

 and the condyles are not very oblique. The inner posterior lobe of the 

 tibial face of the astragalus is quite well defined ; there is no median 

 ligamentous pit on the trochlear face. 



Measurements (from Leidy). 



Inches. 



Depth lower jaw at last molar 3.25 



Length humerus about 21. 



Diameter at condyles 7.50 



Found by Dr. J. V. Carter and Dr. Leidy near Fort Bridger, Wyoming. 



Dr. Leidy has suggested that this species and the Dinoceras mirabilis 

 jf Marsh are identical. 



UlNTATHERIUM MIRABILE. Maisll. 



Dinoceras mirabilis, Marsh, Amer. Journ. Sci. Arts, 1872, October 

 (published Sept. 27). Loc. cit. Jan. 28th, 1873. 



The cranium of this species has been very partially described as above 

 cited, but from figures in the last named paper, largely supply the de- 

 ficiency. From this it is evident that it differs from Loxolophodon comutus 

 in the generic characters already mentioned, and, further, in the anterior 

 position of the naso-maxillary horns, the perforation of the lachrymal, the 

 anterior development of the malar, the oblique occiput, &c. It differs 

 from the E. pressicomis, besides the inferior size, in the shorter nasal 

 bones and greater posterior approach of the pre-maxillary bones to the 

 base of the horns ; in the much shorter horns ^ind greatly smaller part 

 taken in their composition by the nasals. 



These differences account for the great number of errors committed by 

 Prof. Marsh in his allusions to other species, especially Loxolophodon 

 comutus described by me (see his second article above quoted). 



Measurements (from Marsh). 



M. 



Length of cranium (28.5 inches) 722 



Width over orbits 202 



" between summits naso-maxillary cores 169 



" " " nasal " 038 



Height naso-maxillary cores (3 inches) 075 



Length canine (9.25 inches) below jaw 232 



Diameter fore and aft at base 064 



" transverse " " 025 



Length of molar series 150 



Last superior do 036 



a. p. s. — VOL. XIII. I. 



