24 The Ottawa Naturalist. [May 



Mm. 

 Space occupied by molars and fourth premolar. . . 84 



Space occupied by molars and premolars 123 



Space occupied by the six incisors 74 



Length of canine (worn at tip) protruding beyond 



inner edge of alveolus 60 



Transverse diameter of canine at edge of alveolus 26 

 Antero-posterior diameter of canine at edge of 



alveolus 42 



A large median foramen (length 19 mm., width 11 mm.) 

 occurs behind the anterior palatine foramina, its centre being in 

 line with the posterior edge of the alveolus of the first premolar. 

 The posterior palatine foramina are placed rather far back in 

 line with the hinder half of the second molars. There are two 

 external infraorbital foramina, one above the other, and distant 

 about 17 mm. apart, in line with the anterior portion of the first 

 molar. 



Mm. 

 Length of skull from inion to anterior end of pre- 



maxillary (20^ inches) 521 



Length of skull along base from vertically below 

 apex of inion to anterior end of premaxillary 



(l^in.) 506 



Length of skull from posterior edge of occipital 



condyle to anterior end of premaxillary 463 



Distance from anterior end of premaxillary to 



posterior nares . 260 



Elevation of forehead vertically above posterior 



extremity of posterior molar (estimated) 200 



Width between inner border of posterior molars.. . 93 

 Width between inner edges of alveoli of canines. . '. 74 

 Extension backward of sagittal crest beyond oc- 

 cipital condyle 43 



Extreme breadth across zygomatic arches 364 



Breadth across postorbital processes of frontals. . . 205 

 Height of sagittal crest vertically above postglenoid 



process 215 



Breadth across mastoid processes of periotics 240 



Combined breadth of occipital condyles 89 



Diameter of foramen magnum : 



Vertical 39 



Transverse 40 



The Gold-run creek skull is considered to represent a species 

 of Arctotherium, hitherto undescribed, for which the name 

 yukonense is proposed, with the skull as the type (Cat. No. 7438). 



