122 NEW YORK ZOOLOGICAL SOCIETY. 
Characters.—Size large; skull and horns broad and massive; molar 
teeth much larger than in any known American sheep, the upper tooth- 
row in adult males measuring 96 mm. or more, and the three upper molars 
63-65 mm. Under-jaw (in type specimen) massive, heavy posteriorly, 
deeply bellied (depth under last molar 52 mm.); angle broadly rounded. 
In canadensis the jaw is light throughout, and the angle, while small, is 
marked. Horns narrower and as a rule longer than in canadensis. 
The animal is named in honor of Audubon, who, in 1843, obtained from 
the Badlands specimens which he supposed the same as the Rocky Moun- 
tain species.T 
Dacota Country in the year 1855’ (published in 1856), Dr. Hayden states that 
the bighorn was abundant in the region known as the badlands, and the narrative 
shows that the particular badlands meant are those between the Cheyenne and 
White Rivers in South Dakota. 
+ Quadrupeds of North America, Vol. II., pp. 163-172. 1851. 
