e 



107 



Li Ilea. 



Breadth fore ami aft of the outer articuhir facet for the astragahis 'S3 



Breadth trausverselj^ of the iuuer articular facet for the astragalus . . , 18 



Breadth fore and aft of the inner articular facet for the astragalus 2i 



Breadth transversely of the articular facet for the cuboid 14 



Breadth vertically of the articular facet for the cuboid 10 



Astragalus. 



Lines. 



Greatest breadth fore and aft of the astragalus at inner side uO 



Greatest breadth transversely of the astragalus 52 



Greatest thickness of astragalus 32 



Breadtli of tibial articular surface at niidillo transversely ' 38 



Breadth of tibial articular surface at middle fore and aft 32 



Breadth of articular facet for scaphoid 40 



Depth of articular facet for scaphoid 28 



Cudoid. 



Linos. 



Depth of the cuboid 25 



Breadth of the cuboid interiorly 25 



Length of the cuboid at center 15 



The canine tooth, originally described and referred to a carnivore with the 

 name of Uintamastix atrox, is represented in Figs. 1 to 3, Plate XXV. T 

 specimen is broken into two pieces, is mutilated at the point, and has lost 

 apparently several inches of the base. In its perfect state the tooth approxi- 

 mated a foot in length, of which it now retains about three-fourths. It is saber- 

 like in general form — long, laterally compressed cyliudroid, and moderately 

 curved. It appears more curved at the base, and from this position, also, has a 

 somewhat outward deflexion, so that the tooth in its course curved forward and 

 downward with an outward divergence. Laterally from the base it gradually 

 tapers to the point ; fore and aft it gradually narrows to near the lower third, 

 when it becomes slightly expanded before tapering, so as to assume the shape 

 of a lance-head. This likeness is rendered more striking internally by the sur- 

 face being concavely impressed in front and behind the axis extending toward 

 the trenchant borders of the lance-head extremity. Externally, it is impressed 

 in like manner to a less extent posteriorly, but not anteriorly. Above the 

 lance-head extremity of the tooth it is obtusely rounded in front and Ijehind, 

 and in this position is eUiptical in transverse section, as represented by tlie 

 (ludine, Fiir. 5. A section near the middle of the lance-head extremitv has 

 llie form represented in Fig. 4. 



The tooth, so far as tlie specimen extends, appears to have been invested 

 willi thin enamel throughout. Externally, if reaches lo the broken edge of 



