socket of the other two molars of the Ursus spelceus ; the grinding sur- 

 face of the tooth is quite entire and unworn. 

 9. A portion of the right superior maxillary bone of the Cave Bear, con- 

 taining- the three posterior molar teeth ; these, from the integrity of their 

 grinding surface, have belonged to a young but nearly full-grown indi- 

 vidual. 



10. The intermaxillary and part of the maxillary bones, showing the sockets 

 of the upper incisors and canines, together with the foramina incisiva, of 

 the Cave Bear. 



\ 1. The right ramus and a portion of the left ramus of the lower jaw of the 

 Cave Bear : it differs from that of the Ursus ferox in the greater breadth 

 of the posterior molar as compared with its length, and in the greater 

 convexity of the inferior contour of the ramus of the jaw, and in which 

 circumstance likewise it differs, though in a somewhat less degree, from 

 the Black Bear of Europe ( Ursus arctos). 



II 1 . The lower jaw of a nearly full-grown Grisly Bear. 



12. The right ramus of the lower jaw of the Ursus spelceus, with the canine 



and molar teeth. 



13. The left ramus of the lower jaw of the Ursus spelceus, with the canine and 



molar teeth. The crowns of the teeth show these specimens to have 

 belonged to a young full-grown individual. Compared with the lower 

 jaw of the Grisly Bear, they present the same difference in the relative 

 breadth of the last molar tooth as in the specimen No. 11. 



14. The left ramus of the lower jaw of the Ursus spelceus with the first, third 

 and fourth molar teeth, the tuberculated surfaces of which are unworn. 



1 5 . The posterior part of the left ramus of the lower jaw of the Ursus spelceus ; 



it shows the same character of the convex lower margin as the preceding 

 specimen. 



16. A fragment of the left ramus of the lower jaw of the Ursus spelceus, with 



the second molar tooth in situ, the tubercles of which are worn down. 

 It also shows the socket of the first molar, and a portion of the socket 

 of the third molar, and of that of the great canine. 



