NOTES ON THE CANID.E OF THE WHITE RIVER OLIGOC'ENE. 



383 



does not extend over upon the styloid process, from which it is separated by a broad and 

 deep notch. 



The ulna is, in its way, as peculiar as the radius. The olecranon is quite typically 

 fissipede in character and differs from that of the creodonts in its comparative shortness 

 and breadth ; though proportionately somewhat longer than in Cards, it is hardly so lung 

 as in Daphcmus, and the sulcus for the tendons of the anconeal muscles is more distinct 

 than in the former. The sigmoid notch is hardly so deep as in Cam's, and, in particular, 

 the internal facet for the humerus jn'ojects less in front of the plane of the shaft, and the 

 external process is very feebly developed. The radial facet is narrower and less deeply 

 concave than in the modern Canidce, but has a somewhat greater vertical diameter. 



The shaft of the ulna is decidedly less reduced than in the recent representatives of 

 the family, and for most of its length is little or not at all more slender than that of the 

 radius. In its proximal portion the shaft is much more compressed laterally and thicker 

 antero-posteriorly than in Canis, in which genus this portion of the shaft is trihedral. 

 The middle and distal portions are of triangular section, none of it having the subcy- 

 lindrical shape which characterizes the distal one-third of the shaft in the recent genus. 

 The distal end has quite a different shape from that seen in Daphcemts,& difference which 

 is due to the much greater prominence of the radial facet in the latter. In Cynodictis 

 . this facet is almost sessile and projects but little more than it does in Canis, The car- 

 pal facet is very small and quite simply convex. 



Measurements. 



Scapula, length 



' ' greatest width 



" width of neck 



" ant. post- -diameter of glenoid cavity. 

 " transverse " " . 



Humerus, length 



ant. post. diam. prox. end. 



" transv. " " " 



breadth of distal end 



" " trochlea 



Radius, length 



" ant post. diam. prox. end 



" transv. " " " 



" breadth of distal end 



" " carpal facet 



Ulna, length 



" of olecranon 



" thickness of olecranon 



No. 10493. 



.012 



.057 

 .005 

 .007 

 .012 

 .0055 



No. 11012. 



0.054 

 ?.049 



.075 

 .015 

 .011 

 .016 

 .012 

 .061 

 .006 

 .007 

 .013 

 .C06 

 .072 

 .007 



No. 11381. 



No. 11382. 



.013 



.012 

 .008 



.019 

 .016 

 .020 

 .0145 



.007 

 .009 

 .013 

 .007 



.010 

 .010 



.0095 



.007 



.070 



.015 



.013 



.015 



.011 



.005 

 .007 



.0095 

 .OOS 



No. 11432. 



.0095 



.007 



.070 



.015 



.0125 



.005 

 .007 

 .009 

 .0055 



.009 

 .OOS 



A. P. S. — VOL. XIX. 2 w. 



