548 OREODON OF NEBRASKA. 



SPECIES OF OREODON. 



OREODON CULBERTSONII. Leidy. 



(Tab. x., figs. 4, 5, 6 ; xiii., figs. 3, 4.) 



Merycoidodon Culbertsonii : Proc. Acad. Nat. Sci., vol. iv. p. 47 ; pi. figs. 1-5. 

 Oreodon priscus : ib., vol. v. p. 238. 

 Cotylops speciosa, ib., p. 239. 



Of this species, the head of which is about the size of that of the Newfoundland 

 dog, there are the following specimens in the collection of Dr. Owen. 



1. A nearly entire bead, wanting only the end of the nose, incisors and their alveoli, upper canines, 

 the right zygoma and post-orbital arch, a small portion of the left zygoma, the posterior two-thirds of the 

 sagital crest, and the angle of the right side of the lower jaw, to be complete. (Tab. x., 5, 6.) From 

 its relation of size with the specimen next designated, it is presumed to be the head of a female. 



ADMEASUREMENTS.* 



Breadth of face at infra-orbitar foramina, . . . . .181 



" " above first premolars, . . . . .15 



Height of face from infra-orbitar foramina to ends of anterior angular pro- 

 cesses of os frontis, ....... 16 



Breadth of nasal bones at the ends of the latter processes, . . . 8| 



Length of series of superior molars, ..... 40$ 



" " inferior " . ... 40 



" " superior true molars, . . . . .22 



" inferior " " . . . . 241 



2. A skull (Tab. x., 4), accompanied by a small fragment (Tab. xiii., 4) of the right side of the lower 

 jaw, containing the three true molars broken. The former has the end of the nose, zygomas, and occipito- 

 sagital protuberance broken away. The forehead is somewhat crushed, but otherwise, excepting fractures, 

 without displacement of fragments, the specimen is pretty perfect. It contains all the molar teeth of 

 both sides, the left canine, and the root of the right. 



From the greater degree of robustness of this specimen, compared with that indicated in Number 1, it 

 is presumed to be of a male individual. 



The face is more flattened above, and its transverse section has a more square appearance than in the 

 female. 



The molar teeth are more robust than in the latter, and the canines are also more robust and project 

 more outwardly. 



* A short table of admeasurements is appended to the description of each specimen, so as to present the 

 extent of variation in size in different individuals of the species. 



