48 



Or.EODON. 



half lines in extent existed between the canines and incisors, but in the specimen 

 under inspection no hiatus existed in a corresponding position of the lower jaw, 

 the lateral incisor having been in contact with the canine. (Plate II. Fig. 2.) 

 From the collection of Dr. David Dale Owen. 



MEASUREMENTS. 



Inches. Lines. 



Breadth of face at infra-orbitar foramina 1 6} 



BreaJtli of fiiee above first premolar 1 3 



Distance from infra-orbitar foramina to frontal angular processes ... 1 4 



Breadth of ossa nasi at the points of the latter processes .... 8:} 



Length of series of upper molars 3 41 



Length of series of lower molars ........ 3 4 ' 



Length of series of upper true molars ....... 1 10 



Length of series of lower true molars 2 J 



10. A skull with the anterior extremity of the nose, the zygomata, and summit of 

 inion broken away. The forehead is slightly crushed, but otherwise the specimen 

 is comparatively well preserved. It contains all the molar teeth of both sides, the 

 left canine, and the fang of the right canine. A small fragment of the right side of 

 the lower jaw, containing the true molars, accompanies the former specimen. 



The skull I suspect to have belonged to a male individual of Oreodon Culbert- 

 sonii, on account of its generally more robust character than most of the others 

 which have been indicated; and specimen 9, particularly, I suppose to have 

 belonged to a female. 



Besides the relatively greater degree of robustness of the male skull of Oreodon 

 Culhertsonii, the face is depressed or flattened above, or is not so much arched as 

 in the female, and in transverse section it has a more square than conoidal appear- 

 ance, as in the latter. The molar teeth, also, are more robust, and the true molars 

 possess a well-developed ridge between the bases of the external columns or but- 

 tresses, and a feebler ridge exists externally at the base of the premolars. The 

 canines are a little more robust, a little longer, and project a trifling degree more 

 outwardly. 



In the specimen under immediate inspection, the supra-orbitar foramina are nearer 

 the centre of the forehead on each side than in any of the preceding. 



The parietal region on one side of the sagittal suture presents an irregularly 

 eroded and areolated vascular appearance, with several slight thin exostoses, indi- 

 cating inflammation to have existed during the life of the animal. (Plate III. 

 Figs. 1, 2.) 



From the collection of Dr. Owen. , 



MEASUREMENTS. 



Breadth of fiice at infra-orbitar foramina .... 

 Breadth of fiice above first premolar ..... 

 Distance from infra-orbitar foramina to frontal angular processes 

 Breadth of ossa nasi at the ends of the latter processes . 

 Length of series of upper molars 



lies. 



Lines 



1 



72 



1 



7J 



1 



4 





OJ 



3 



7J 



