62 ME. G. BUSK ON THE ANCIENT OE 



in PI. V. figs. 4, 5, whilst that containing the second molar is shown separately in 



fig. 7. 



The specimen when put together exhibits the small angular crochet and a mere 



rudimentary uncinus, about half of the condyle, and a portion of the coronoid process, 



together with a part of the horizontal ramus containing the two hinder molars m. 2 



and m. 3 in beautiful condition. These teeth measure : — 



in. 



^n i-ox-7 



■^"3 -g-xe 



The third molar is oblong with parallel sides, but constricted behind, chiefly on the 

 inner side. There is no trace of a sulcus on the outer border (vide infra) ; and the 

 surface is very faintly sculptured. 



6. The only other specimens connected with the dentition are two detached canines, 

 both of comparatively small size, and resembling in general characters those of 

 U. arctos. They measure -Qx'SS and -Ox "65 respectively. One is figm-ed in PI. V. 

 fig. 6. 



Of the other parts of the skeleton those chiefly worth noticing are : — 



7. A nearly entire axis vertebra, wanting only the posterior epiphysis of the centrum 

 (PI. VI. figs. 7, 8, 9). The body, including the odontoid process, and allowing 0"-l 

 for the missing epiphysis, measures 2"'7 in antero-posterior length. The width from 

 side to side across the anterior articular processes is 2"-6, and the length of the spine is 

 also 2"-6 ; the neural canal is l"'l in diameter. The width from side to side at the 

 posterior articular facets is nearly 2"-3. The width of the body at the narrowest part 

 is 2"'0, and the entire height of the bone 2"-l. 



8. The proximal half, or rather more, of the left ulna (PI. V. fig. 1) of an old and 

 apparently very muscular individual. The olecranon, measured in the antero-posterior 

 dii'ection from the upper point of the greater sigmoid cavity, is 2"'6 wide, and the dis- 

 tance from the same point to the point of the coronoid process 2"'0. The "length of 

 the lesser sigmoid cavity is 1"'8. 



The corresponding measurements in an ulna of U. horriMlis {ferox), Baird, from 

 California, are 2"'7, 2"'0, 1""8, or as nearly as possible the same. In another speci- 

 men of the smaller variety of the Grizzly Bear [U. richardsoni, Baird), the dimensions 

 are 2"-5, l"-9, l"-5. 



9. The corresponding part of a second right ulna of a younger and less robust 

 animal, but otherwise agreeing with the above. 



10. The proximal end of the right radius, which fits to the last-mentioned ulna, and 

 no doubt belonged to the same skeleton. Its proximal articular head measures I"-7 x 

 1""25, and the least circumference of the shaft is 2"'6. 



11. One of the most remarkable among the ursine remains consists of the nearly 

 entire right tibia, with the upper end of the fibula attached above, by bony ankylosis, 



