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The two skulls vary considerably: the first is much broader, the 
palate wider, the nose shorter, and the orbit smaller, rounder; the 
second, from the Rocky Mountains, is narrower, the nose longer, the 
palate much wider, and the orbit much higher and more oblong. 
The lower jaw with a straight lower edge, very slightly bent up 
behind the chin, and scarcely bent up at the hinder end. “The outer 
lower cutting-teeth larger, and lobed on the outer side. The outer 
upper cutting-teeth larger, with a lobe on the inner side. The two 
front upper false grinders very small, far apart ; the third larger, 
three-lobed. 
There are two skulls in the Museum collection ; they both agree 
in being narrower than the skull of U. arctos of Europe, in having a 
much larger hinder tubercular grinder, and in having a narrow open- 
ing to the hinder nostrils, which are oval at the front edge; the size 
of the opening differs considerably in the two specimens, being smaller 
aud narrower in the oldest one. Nasal bones elongate, nearly to a 
line in middle of orbit. Length of hinder grinder in all long, about 
1} inch. 
The skull collected by Mr. Douglas and sent to the Zoological So- 
ciety is 142 inches long, from front teeth to end of condyle; palate 
73 inches long; width at back of zygoma 83 inches; width of nose, 
at aperture of artery, 31 inches; length of last grinder 14 inch; 
length of suture of lower jaw 3}. The hinder nostrils wide, 14 inch 
in widest part, rather narrower behind ; length 3 inches. 
The skull of an old specimen that lived many years in the Tower 
and in the Zoological Gardens, with some of the grinders and the 
canines worn down.—The internal nostril is narrow, rather wider 
behind than in front ; the front edge ovate. Length of the skull below, 
from front cutting-teeth to end of condyle, 14 inches, of palate 72 
inches ; width at back of zygoma 10 inches, of nose, at hole of artery, 
34 inches ; length of suture of lower Jaw 33 inches; width of nose- 
aperture 2 inches, rather higher than wide. 
9. Ursus (Danis) HorRIACEUs. 
Ursus arctos? (Barren-ground Bear), Richardson, Fauna Boreali- 
Americana (see Baird, Mamm. N. A. 229). 
U. horribilis, var. horriaceus, Baird, N. A. Mamm. t. 80 (skull); 
Rep. Mexican Boundary. 
fab. New Mexico, Sonora. 
This Bear, according to Sir John Richardson, exhibits peculiarities 
not found in the Grizzly Bear of the Pacific Coast. 
Ursus horribilis, var. horriaceus, Baird, Mexican Mamm. 24 - 
