NOTES ON THE CANIIXE OF THE WHITE EIVEE OLIGOCENE. 



345 



change which is obviously correlated with the increased size of the radius. The distal 

 end of the ulna in Daphceaus is narrow and carries a continuous convex articular surface, 

 which is not divided into separate facets for the pisiform and pyramidal. The distal 

 radial facet is raised upon a prominent projection, another point of resemblance to the 

 cats and of difference from the existing representatives of the Canidce. 



Measurements. 



Humerus, width of distal end 



" " trochlea 



Kadius, ant. -post, diameter of head 

 " transverse " " " 



" breadth of distal end 



" " carpal facet 



Ulna, " " distal end 



" " carpal facet 



No. 11424. 



No. 11425. 





0.050 





.033 





.016 





.021 



.022 





.014 





.013 





.008 





V. The Manus. 



Of the carpus the only element preserved is a single scapho-lunar of IK vetus, inter- 

 esting as showing that the coalescence of these elements had already taken place. This 

 bone differs in a marked way from that of both recent canines and felines, but resembles 

 the scapho-lunar of the White River sabre-tooth, Hoplophoneus. It is broad transversely 

 and thick in the dorso-palmar diameter, but very low proximo-distally, even more so 

 than in Canis ; the tubercle at the postero-internal angle of the bone is well marked, but 

 smaller than in the felines or modern dogs. The radial facet is simply convex in both 

 directions, not having the postero-internal saddle-shaped extension which occurs in the 

 recent dogs. This radial facet is reflected far over upon the dorsal and internal surfaces 

 of the bone, converting the inner side into a thin edge, formed by the junction of the 

 radial and trapezial facets. 



On the distal end of the scapho-lunar are three plainly distinguished facets, for the 

 unciform, magnum and trapezoid respectively. The very deeply excavated unciform 

 surface reduces the ulnar side of the scapho-lunar to an edge, not very much thicker 

 than the radial border, and hence there is no well-defined facet for the pyramidal, such 

 as occurs in Canis. The shape and proportions of the unciform and magnum surfaces 

 are very much as in the latter genus, but that for the trapezoid is not demarcated from 

 that for the trapezium, though there can be little doubt that the latter element articulated 

 with the scaphoid, as it certainly does both in Cynodictis and in Canis. The general 



