Cope. J t>2 [Feb. 21, 



the bone, the head of the radius is a little exterior to the middle line, and 

 the shaft crosses the ulna in an open, shallow groove to the inner side. 



The cuboid is flat, and displays two proximal and two distal articular 

 facets in U. furcatum. The astragalus of the same species is subbifurcate 

 posteriorly, and has internally an extensive, oblique malleolar fossa. The 

 calcaneum is short and massive, with two superior and one small anterior 

 articular facet. 



The species may be thus distinguished : 



1. Large species (occipital condyles extending over about M. 0.170.) 

 Naso-maxillary horns long ; tibia with wide articular 



faces E. pressicornis. 



Horn-cores fiat, elevated E. furcatus. 



2. Species of intermediate size. 



A prominent mastoid process, molars smaller IT. robustum. 



Mastoid process not prominent; maxillary horn-cores low, 

 triangular; posterior horn-cores short, triangular in section XI. mirabile. 



3. Smallest species (occipital condyles extending over about M. .95.) 

 Molar teeth larger, the last with a posterior expansion. . U. lacustrc. 

 Previous to describing the species I notice a part of the skeleton of a 



large mammal, second only in bulk to Loxolophodon and Eobasile us above 

 described. 



These, which were not found in association with a cranium, consist 

 of several vertebra}, some carpal bones, the entire hind limb of the left 

 side except the toes and the cuneiform and navicular bones. 



The odontoid process is very stout, with a descending trihedral apex. 

 Length M. .078, diameter at base, .048. A dorsal vertebra with a single 

 ! anterior) capitular articular face, is quite concave in front. 



M. 



Diameter antero-posteriorly 057 



" vertically 094 



A cervical vertebra has the proportions of the dorsal as to its centrum, 

 thus differing materially from species previously described. The articu- 

 lar surfaces are slightly concave. 



M. 



Length (antero-posteriorly) 0.0G5 



Diameter vertical , 087 



" transverse 100 



The femur resembles that of the other species already described, but 

 is remarkable for the relatively small size of the head. While the lengths 

 of the bone are not very different, and the expanse of the great trochanter 

 about the same, the head of L. cornutus is large, the present one is 

 very much smaller, and that of E. pressicornis intermediate. There is a 

 rudimental third trochanter, and the condyles are as large as, and similar 

 to those of, E. pressicornis. The external marginal condylar ridge is 

 quite short. The shaft is broken and some small pieces lost ; it is now 20 

 inches long, but was no doubt longer when complete. 



