VERTEBRATE REMAINS, PORT KENNEDY BONE DEPOSIT. 235 



Measurements. 

 No. 1 — Superior m 1 . 



mm. 



~. ( anteroposterior ; 8 



Diameters < , x 



( transverse, greatest ; b 



No. 2 — Both mandibular rami. 



Length of premolar series ; 11 



" of molar series; 13.5 



t^. (anteroposterior; 10 



Diameters, m T { , o ■> -, o 



' 1 ( transverse oi heel ; o 



tv , f anteroposterior ; 3.5 



Diameters, m^ < , l ok 



- { transverse; Ao 



Depth of ramus at pm. 1 ; 9 



" at m. 2 ; 10 



No. 3 — Smallest ramus. 



Length of last three molars ; 1 7 



" ofm T ; 9.5 



Depth of ramus at pm. 1 ; 6 



" at m. 2 ; 8 



In two last superior molars the short angle connecting the metaconule with the 

 paraconular crest is rudimental or wanting, so that the arrangement only differs 

 from that of M. fossidens in the greater separation of the metaconule from the crest. 

 Such teeth are nearly transitional between the two species, but they maintain the 

 inferior size of M. orthostichus. The two types of molars might be regarded as 

 representing male and female, but for the difference in the relations of the inferior 

 premolars, as pointed out in the analytical table of species. 



Mephitis leptops Cope (PI. XVIII, figs. 9, 9a). [Type No. 75, Mus. Acad. Nat. Sci. Phil] 



This skunk is represented by two mandibular rami in the collection of the 

 Academy. One of these contains the alveoli of all the teeth excepting the incisors, 

 but no teeth; the other supports the pm T and m T , and contains the alveoli of the 

 m-2- anc ^ P m T- I 11 the absence of the anterior part of the ramus it is not certain 

 whether the second jaw belongs to the same species as the first, or type, but the 

 peculiar proportions are the same in both. 



While the dimensions are smaller than in any of the species excepting 

 M. obtusatas, equalling those of M. putorius, the mandibular ramus is relatively 

 more slender than in any of them. The inferior border rises from below the m^- to 

 the angle. The symphysis is more vertical than in M. mephitica, and the ramus is 

 regularly convex from the canine posteriorly, and not concave, as in M. mephitica. 

 The premolar series is short ; the pms. T _g- are both two-rooted, and stand very 

 obliquely in the jaw, overlapping each other considerably. The sectorial has the 



