324 Nov. 1847. 



cess similar to that of many Rodentia and Camivora, and exists in no other 

 Ruminantia excepting the Camelidce. Just above the base, where it curves 

 downwards and backwards, is a short crescentic depression made by the 

 attachment of the masseter muscle. The processus coronoideus has been 

 proportionately about as long as that of the Ovis aries. The depression be- 

 tween the processus coronoideus and condyloideus upon the outer face of 

 the ramus is comparatively deep, resembling more that of a carniverous 

 than a ruminating animal. The anterior mental foramen is placed im- 

 mediately posterior to the commencement of the symphisis. About one inch 

 and a half to posterior to the latter foramen, on a line with the separation 

 of the first true and last premolar, is another and smaller foramen, which 

 is common to most Ruminants. 



The ossa maxillaria superiora, below the situation of the ossa nasi, are 

 very much depressed, so as to make this part of the face extremely narrow. 

 Just anterior to this depression is a prominence resembling that produced 

 by the root of the canine tooth of the 3Ioschus, although I doubt very much 

 whether this animal had such large canine teeth, if it had any at all, because 

 of the very great narrowness of this part of the face, and the very advanced 

 position of the first premolar. 



The infra orbitar foramen is further back or more approached to the orbit 

 than usual, being situated on a line above the fourth premolar. 



The anterior part of the orbit is elevated so that the latter looks directly 

 outwards. 



The body of the os mala is narrowed and elongated backwards. The 

 zygoma proper, or that which is posterior to the frontal process of the 

 os malae, is short. 



The meatus auditorius externus borders immediately upon the glenoid 

 cavity. The tympanic bone is inflated and comparatively larger than in 

 Bos bovis, Ccrvus rufescens, or any other Ruminant with which I am ac- 

 quainted. Externally it projects beyond the face of the lower jaw and the 

 meatus externus. Viewed posteriorly, it presents two parallel ampullae, 

 united anteriorly, and separated posteriorly by a notch, which terminates 

 in a deep depression below for accommodating the processus styloideus. 



The portion of os humeri, consisting of the articular surface for the elbow 

 and posterior sigmoid cavity, presents nothing peculiar. 



The ulna, where it is broken off about three-fourths of an inch below the 

 articulation, has nearly the same thickness as the radius, and probably has 

 been proportionately larger than usual. 



These bones belonged to an animal rather less in size than the Dorca- 

 Iherium. 



The species I have designated Wilsoni, in honor of Dr. Thomas IB- 

 Wilson, the munificent patron of the Natural Sciences. 



Probable habit of the animal. From the evidences of considerable mus- 

 cular strength in the posterior part of the inferior maxilla and the trenchant 

 crowns of the anterior premolars, it might be supposed that the animal was 

 adapted to eating flesh as part of its food, as was thought by Cuvier to have 

 been probably the case with the Anoplotherium gracile, a pachydermous ani- 



