570 GEOLOGICAL SURVEY 0*F THE TERRITOEIES. 



The teeth are remarkable for the extent of the exposure of their slender 

 roots, as well as their very small size as compared with the size of the 

 animal. The tusk is slightly turned outwards at the tip and the inner 

 face is worn by attrition with some opposing tooth for one- third its length 

 on the posterior third. The superior margin of the enamel on this side 

 is chevron-shaped, the apex being only one-third the length from the 

 extremity. It extends further upwards in front and on the outer side, 

 but is worn in an oval patch at the apex of the chevron of this side by 

 contact with the inferior teeth, as above described. The enamel is smooth 

 behind, rugose in front. The apex contracts regularly to a flattened 

 obtuse point. The fang is hollow for about half its length. The enamel 

 of the molars is nearly smooth. Each one has a strong cingulum fore 

 and aft, which is discontinued on the inner and outer faces except in P. 

 M. 1, and M. 2. In the former, it is continued on the outer side at the base 

 of the concavity of the exterior face ; on the latter, it is continued 

 round the inner side. The grinding surface of the P. M. 1 is tripodal, 

 and i}robably composed of a worn crescent and inner tubercle. The 

 others are transverse arrov7-shaped ; the P. M. 4 is much more worn than 

 the others. M. 2 is larger than M. 1. Its oblique crests have evidently 

 been worn from before. All the molars have tliree roots, but the poste- 

 rior pair are united for part of their length in all. 



The vomer does not unite with the su]3erior crest of the palatine bones. 

 The sphenoid flattens out behind the postnareal trough and is co-ossified 

 with the basioccipital. The latter is marked by two oval surfaces at the 

 place of suture, with a slight prominence between. No lower jaw was 

 found with this specimen, but from the contraction of the parts opposed 

 to it, it was evidently very small. 



Cranial measurements. 



M. 



Length from end nasals to end occipital condyle, (3 feet 1.5 inches) 0.930 



Width just behind end nasal shovels 192 



Width in front of horns , 132 



Width at base of horns in front , 205 



Width behind horns at apex of frontal suture 185 



Width above posterior edge meatus auditorius .310 



Width between apices horn-cores 370 



Width basis snpraoccipital horn-core 100 



Width including zygomatic arches, (greatest) 320 



Length of nasal bones to ridge between horn-cores , 410 



Length of nasal bones to frontal suture 540 



Length of zygomatic fossa above 230 



Length from angle uares to end shovel 205 



Length from angle nares to end premasillary 155 



Length from end premaxillary to basis of canine 120 



Length from end premaxillary to basis of P. M. 1 ^ 276 



Length of molar series 185 



Length of palate 450 



Length of ptery go-palatine crest 200 



Length of sphenoid axis 185 



Length of basioccipital, (with condyles) 128 



Width between tips premaxillaries 070 



Width at canine alveoli , 185 



Width between canine alveoli 080 



^^'idth at diastema 050 



Width between last molars 070 



Width between pterygo-palatine crests 065 



Width of post-glenoid process 095 



Width between post-glenoid processes 095 



Width basioccipital at front 073 



Width basioccipital at condyles 200 



Width of space for tympanic chamber 034 



Length tusk on curve, (12.7 inches) 320 



