438 



THE VERTEBRATE SKELETON. 



only in the absence of the last upper molar. The upper 

 carnassial tooth (fig. 84, II.) consists of a larger middle and 

 smaller posterior lobe with hardly any trace of an anterior 

 lobe. The lower carnassial (fig. 84, V.) is typical, consisting 

 of a bilobed blade with inner cusp and posterior talon. 



The dentition of the Cynoidea is most closely linked with 

 that of the Arctoidea by means of fossil forms. 



In the Arctoidea the dentition is not so typically carnivorous 



FIG. 85. MANDIBLE OF ISABELLINE BEAR (Ursus isabellinus) x 

 (Camb. Mus.) 



1. condyle. m 1. 



2. coronoid process. 

 i 1. first incisor. 



first molar. The dotted 

 line is pointing to the pos- 

 terior half of the tooth. 



c. canine. 



pm 1, pm 2. first and second pre- 

 molars. 



This specimen has only 

 three premolars, there 

 should be four. 



