218 VERTEBRATE REMAINS, PORT KENNEDY BONE DEPOSIT. 



separated from the anterior border by a very shallow concavity, while a very distinct 

 concavity separates it from the posterior border. The long axes of the two extremi- 

 ties of the tooth are not in the same plane. The inferior canine molars are but 

 little curved, and. they have a slight median convexity. What distinguishes them 

 from M. wheatleyi is the greater width of the grinding face transversely, as com- 

 pared with the long diameter, especially at the anterior and posterior edges of the 

 crown. This thickness corresponds with the increased transverse diameter of the 

 superior canine molars, and, together with the small size, induces me to refer them 

 to that species, although found separately from them. These teeth display no 

 mark of immaturity, but the borders are perfectly parallel. 



The superior molars have the usual section, of triangular form with obtuse 

 apex. The last molar has a truncate internal face, but the external angle is broadly 

 rounded, so as to destroy the triangular form. 



Measurements. 



mm. 



tv „ . ■ , f anteroposterior ; 25 



Diameters 01 superior canine molar w . i i 



-p.. r. ■ r . -, -.f anteroposterior ; 25 



Diameters <>l inferior canine molar no. 1 < , r -, . 



\ transverse ; 14 



T .. o ■ o ■ ■ -i v. ( anteroposterior; 26 



Diameters oi interior canine molar no. 2 { , r -, , 



| transverse ; 14 



tv r q f anteroposterior ; 12 



Diameters ol m-*- < , r 17 



( transverse ; 1 / 



t-v r, , ( anteroposterior; 8 



Diameters ot m- 4 - < , l -, n K 



j transverse ; 11.0 



The teeth of the young individual display the usual character of the contracted 

 grinding face ; but this is much more conspicuous in the canine molars than in the 

 molars. The former display the prominent bulge characteristic of the species. 



Megalonyx scalper Cope (PI. XVIII, figs. 2, 2a). [Type No. 184, Mus. A. N. S.] 



A single canine molar is all that has been found of this species, so far. Judg- 

 ing from this tooth, the species differs more from those already described than they 

 do from each other. 



The tooth is characterized by its compression, so that its transverse diameter is 

 relatively much less than in the other species. The anterior outline is very slightly 

 convex, so that the crown has a very slight curvature. It was implanted a little 

 obliquely, as indicated by the direction of the grinding surface. A marked peculi- 

 arity of the tooth consists in the fact that on the inner side, a little in front of the 

 middle line, is a shallow longitudinal groove or valley, where the teeth of the other 

 species of the genus present a convexity. Anterior and posterior to this valley, the 

 inner side is gently convex. The external side is in general convex, viewed from 

 the grinding face, but not regularly so, since a little in front of, opposite to the 

 internal valley, there is a slight longitudinal convexity. This produces a flattening 



