no. 2086. SOME MAMMALS OF THE PLEISTOCENE— HAY. 



539 



Measurements of the upper teeth in millimeters. 



E.fran- 

 cisci. 



E. tau. 



E. hemi- 

 onus. 



Premolar-molar series, length 



Premolar series, length 



Molar series, length 



Pm2, height 



length 



width 



Erotocone 

 , eight 



length 



width 



protocone 



Pm*, height 



length 



width 



protocone 



M 1 , length 



width 



protocone 



M2, length 



width 



f)rotocone 

 , ength 



width 



protocone 



135 

 74 

 61 

 55 ± 

 28 

 23 

 8 

 60 

 23 

 23 

 10 

 56 

 21 

 23 

 10.5 

 19.5 

 22 

 11 

 20 

 21 

 12 

 21 

 18 

 12 



65 



23 

 20 

 10.5 



23 



19 



10 



21 



20 



11 



22 



18.5 



11.5 



25 



16 



11 



151 

 81 



70 



32 

 24 



25.5 



26 



12 



24.5 



26 



13 



22.5 



23 



11.5 



23 



23 



14 



24 



20.5 



15 



In the lower jaw there are present all the incisors, the three 

 molars of both sides, and the last premolar of the right side (pi. 37, 

 figs. 1, 2 ; text-fig. 5). The following measurements are obtained : 



Measurements of the lower teeth m millimeters. 



E.fran- 



E. hemi- 



ClSCl. 



onus. 



66 



72 



22 



23.5 



14.5 



16 



20 



21.5 



13 



14 



20 



22 



12.5 



14.5 



24 



29 



12 



13 



12.5 





7.5 





12.5 





6 





15 





5.5 





Length of the molar series 



Pm 3 , length of grinding face 



width of grinding face 



M i, length of grinding face 



width of grinding face 



M 2, length of grinding face 



width of grinding face 



M 3 , length of grinding face 



width of grinding face 



1 1, diameter from side to side on grinding surface, 

 diameter from front to rear on grinding surface 



1 2, diameter from side to side on grinding surface, 

 diameter from front to rear on grinding surface 



I a, diameter from side to side on grinding surface, 

 diameter from front to rear on grinding surface 



Owen did not furnish any measurements of the upper teeth which 

 formed the type of his species ; but if we may depend on the measure- 

 ments taken from his figure, as it appears probable that we may, 

 certain differences between the two specimens appear at once. All 

 of the teeth of Owen's type are considerably longer than wide. In 

 E. francisci, if the anterior premolar and the hindermost molar are 

 excepted, the teeth are as wide as long or wider than long. This 

 difference is so great that it appears at once to stamp the two indi- 

 viduals as belonging to distinct species. A study of the teeth of the 

 Texan specimen shows that the arrangement of the enamel forms 



