,")() Miller A J\V/r /'o,s.s// Bear from 



The occiput, viewed from behind, is narrower and lower than in the 

 black bears. This increases the apparent size of the zygomatic arches. 



Tcdh. The teeth are so worn that all trace of their tuberculation is lost. 

 In form they do not appear to differ noticeably from those of U. ainericuiin*. 

 In size, however, the molars and premolars fully equal those of Urxnx 

 hon'ililis, though the canines are no larger than in a specimen of IL amcr- 

 ictonix, and considerably smaller than in the skull of U. j!ori<l<tunx to 

 which reference has already been made. 



Measurements. The following measurements were taken with dividers. 

 They therefore in no case follow the outline of the bone. 



Greatest length 317. Basal length 290. Basilar length (estimated) 273. 



Tip of nasals to line joining tips of postorbital processes 1 10. 



Inion to line joining tips of postorbital processes 173. 



Zygomatic breadth 176. Mastoid breadth 124. 



Breadth across postorbital processes 97. 



Breadth of rostrum across bases of canines 68. 



Least breadth of rostrum 63. Lachrymal breadth 75. 



Greatest breadth of braincase above roots of zygomata 92. 



Fronto palatal depth (opposite anterior base of first molar) 53. 



Occipital depth between audital bullse 80. 



Breadth of palate between posterior ends of last molars 45. 



Breadth of palate at (and including) anterior ends of last molars 79. 



Least breadth of palate between second premolars 45. 



Length of palate from gnathion to plain of posterior edges of last 

 molars 130. .Greatest width of interpterygoid fossa 32. 



Length of glenoid fossa 48. Length of occipital condyle 36. 



Breadth of occipital condyle 16.6. Length of audital bulla 40.6. 



Canine at edge of alveolus 20 x 13. Diastema 21. 



Distance from anterior edge of large premolar to posterior edge of last 

 molar (crowns) 73. The same (alveoli) 72. 



Crown of large premolar 16 x 13. Alveolus of anterior molar 21.8 x 15.4. 



Space between crowns of large premolar and posterior molar 23. 



Crown of last molar 36 x 18.8. 



Remarks. Ursus procerus represents a type of bear, quite different from 

 those found among living members of the genus, characterized by elon 

 gation and depression of the rostrum accompanied by reduction in the 

 braincase. While the rostrum is lengthened and broadened to dimen 

 sions equal to those of the corresponding parts in the grizzly bears, its 

 depth is even less than in the black bears, which the animal as a whole 

 probably resembled in size. Though the canines are small, the molar 

 teeth are probably relatively larger than in any other known bear. This 

 disproportion in the sizes of the canines and molars may be partly sexual, 

 if I am right in supposing that the type skull is that of a female. The 

 characters of the skull and teeth are all opposed to those of the species of 

 Arctotherium. With the other extinct American bears no close compari 

 son can be made. Ursus procerus is not nearly related to the living black 

 bears or grizzly bears. Of neither of these can it be regarded as a directly 

 ancestral type. 



