655 



lower jaw. The teeth of the left side of the upper jaw, and some of those on the left side of 

 the lower jaw, are separately displayed, and are indicated by their symbols. 



Hunterian. 



4016. The skull of a young Grizzly Bear (Ursusferoai). 



This had acquired the mature dentition. It corresponds in age with the skull of the 

 European Brown Bear (No. 4046), but differs hi the greater breadth of the occiput, the 

 larger size of the condyles, and the more prominent and swollen inferior border of the foramen 

 magnum, which connects together the lower extremities of the condyles and projects below 

 the level of the expanded part of the basioccipital. The posterior border of the bony palate 

 is excavated by a deeper and more angular notch. The frontal region is less elevated, and 

 less convex transversely : the nasal processes of the maxiHaries extend backwards beyond 

 the point of the nasals. The fourth premolars of the upper jaw are relatively larger and 

 more tuberculate posteriorly. The interspace between the canine and last premolar is rela- 

 tively longer ; it contains the alveoli of p 1 and p 3 on both sides : the alveoli of the rudi- 

 mentary premolars are obliterated in the lower jaw. The facial part of the skull is relatively 

 longer than in the Ursus arctos, and the nasal processes of the premaxUlaries are much longer, 

 are more slender, and articulate directly with the anterior processes of the f rentals. In the 

 specimen of the young Brown Bear (No. 4046), the maxillaries articulate with the small part 

 of the nasals and separate the premaxillaries from the frontals. The calvarium, which is 

 separated from the rest of the skull, shows the strong bony tentorium and the large olfactory 

 fossae. 



Presented by the Zoological Society of London. 



The following, to No. 4036 inclusive, are parts of the same Ursus ferox : 



Presented by the Zoological Society of London. 



4017. The atlas. 4018. The dentata. 

 4019. The fifth cervical vertebra. 4020. A dorsal vertebra. 

 4021. A lumbar vertebra. 4022. The first thoracic rib. 

 4023. A posterior thoracic rib. 4024. The right scapula. 

 4025. The left scapula. 4026. The right humerus. 

 4027. The left ulna. 4028. The right radius. 



4029. The left radius. 4030. The right os innominatum. 



