224 VERTEBRATE REMAINS, PORT KENNEDY BONE DEPOSIT. 



and the coronoid process rises steeply a short distance posterior to the last inferior 

 molar. The masseteric fossa is well marked, following the inferior border of the 

 ramus more closely than in U. arctos. It is bounded in front by a strong ridge 

 which extends downward and backward from the base of the coronoid process, 

 descending to near the inferior border of the ramus well in front of its anterior 

 angle. This ridge is unlike anything in this region in any of the species of the 

 genus known, but a similar character is present in Tremarctos ornatus, and is 

 represented in DeBlainville's figure of a young animal. 1 Anterior to this ridge is 

 the basin-shaped concavity already described, which is also peculiar to this species 

 and to T. ornatus. The anterior angle of the inferior border is prominent and 

 apparently obtuse. It is not present in DeBlainville's figure of T. ornatus. The 

 mental foramen is below the third premolar. The condyle is more elevated in posi- 

 tion than in the species of U. arctos group, since, when the jaw rests on a horizontal 

 surface, its superior border is in the same plane as the apex of the inferior canine. 

 In U- arctos and U. maritimus its upper surface is in the plane of the grinding 

 surfaces of the molars. The articular surface presents more posteriorly than in 

 those species and has no absolutely horizontal surface, such as is seen in the latter. 

 The ramus, which displays its internal face, exhibits a shallow longitudinal con- 

 cavity below the middle line. 



Measurements of skull and teeth. 



mm. 

 No. 1 (type). 



Length from angle of junction of lines of anterior and inferior orbital 



borders ; 95 



Depth from inferior orbital border to alveolar border at m^ ; 70 



Length from mandibular condyle to anterior base of coronoid process; 111 



Elevation of coronoid process above horizontal line anterior to condyle 



of mandible ; 77 



Length of superior molar series; 114 



w , , I anteroposterior; 36 



Diameters ol m^ { , r , ' ,, 01 



| transverse (greatest) ; 21. 



tv p i I anteroposterior; 23 



Diameters oi m 1 { , L ■, «■ 



{ transverse ; 1 / 



tv o i f verticle in front; 10 



Diameters oi pin- 1 - { , , • -, c 



1 (anteroposterior; lo 



Anteroposterior diameter of canine at base of crown ; 34 



Length of series of posterior five inferior molars; 99 



" " of inferior true molars ; 77 



tv j, ( anteroposterior ; 20 



Diemeters ot m^ < , L -, P 



3 I transverse ; lb 



tv c anteroposterior; 22 



Diameters oi m^- { , x n 



1 | transverse; 18 



tv c (anteroposterior;- 29 



Diameters of m T { , r f -, -, -, o 



1 | transverse oi heel; 13 



1 Ostdographie, Carnassiers, PI. VIII, fig. (no number). 



