246 VERTEBRATE REMAINS, PORT KENNEDY BONE DEPOSIT. 



Measurements. 



mm. 



( longitudinal; 7 



2 \ transverse ; 5 



-rv ~ c T longitudinal; 10 



Diameters ot crown oi 1- -' ° 



° { transverse ; i 



-r.. j, /- I longitudinal; 16 



Diameters ot crown ot n < , ° 



^ { transverse ; / 



t^.. r p I vertical; 6.5 



Diameters ot crown ot puk , , . -, n 



1 2 \ anteroposterior; 10 



( vertical; 14.5 



Diameters of crown of pm T ^ longitudinal; 19.5 



( transverse at lobe ; 9 



f vertical; 11.5 



Diameters of crown of m T -' longitudinal; 22.5 



(transverse at middle; 10 



Length from I T to posterior edge coronoid process; 142 



" 1^ " " m T ; 105 



" of inferior diastema ; 36 



Depth, symphysis ; 49 



" mandible at pi% ; 31 



" " at dental foramen ; 34 



Height of coronoid process posteriorly ; 28 



The premolar teeth on which the species was founded present the following 

 characters. In the pm T the crown is narrower in proportion to its length, and the 

 base is convex anteroposteriorly on the external side, and concave on the interior 

 side to a greater degree than in any of these species of Uncia. As a result the 

 protocone is more convex on the outer than on the inner side, while the reverse is 

 the case in the recent species of Uncia and in U inexpectata. It has also a strong 

 obliquity posteriorly to the apex, so that the anterior cutting edge is longer than the 

 posterior, a character not seen in the species named, but characteristic of the genus 

 Smilodon. The obliquity is much less evident in a superior second premolar, which 

 has otherwise the same general character. In the inferior premolar the posterior 

 cutting lobe is more developed than in any of the American species of Uncia, being 

 separated from the adjacent parts by deeper fissures. The heel is quite prominent 

 and has a superior cutting edge of a more pronounced character than in any of the 

 species above named. The anterior basal cusp is larger than the heel and has also 

 a superior longitudinal cutting edge. 



The superior premolar is much like the larger one, but the protocone is less 

 elevated and less oblique to the horizontal line of the base. 



Measurements. 



mm. 



( vertical ; 14 



Diameters of pmy -^ longitudinal ; 21 



( transverse, posteriorly; 9 



| vertical ; 8.5 



Diameters of pmf-< longitudinal ; 16 



(transverse, posteriorly; 7.5 



