NOTES ON THE CANID^E OF THE WHITE RIVER OLIGOCENE. 



367 



Daphcenus it is still distinctly visible, though very small. The proto- and metaconidfi 

 are of equal size and placed on nearly the same transverse line ; these cusps are higher, 

 more sharply pointed and more slender than in the recent Canidce. The talon, which is 

 somewhat lower than the anterior half of the tooth, retains a distinctly basin-like form. 

 In the European species we find a more primitive character of m % in the retention of the 

 paraconid. The third molar is very small ; it has an oval, roughened crown and is car- 

 ried upon a single fang. As Cope has pointed out, this tooth is usually missing in tin- 

 fossils, and occasionally a specimen is found which has not even an alveolus for it. 



The dentition of Cgnodictis gregarius is, on the whole, a little more modernized and 

 advanced than that of the European representatives of the genus. This advance is shown 

 in the reduction of the inner cusp of the upper sectorial ; in the somewhat more quad- 

 rate outline of m A ; in the less elevated shearing blade and more posterior position of 

 the metaconid on the lower sectorial, and, finally, in the more complete reduction of the 

 paraconid of m %. In the John Day species, especially in C. geismarianus and C. 

 latidens, the departure from the European type is even more marked. 



Measurements. 



Upper dentition, length I 1 to M 2 ... 



Upper canine, ant.-post. diameter 



" transverse " 



" premolar series, length 



" molar series, length 



" P 1, length 



" P2, " 



" P3, " 



'* P4, " 



" P4, breadth 



" M 1, length 



" M 1, breadth 



" M 2, leDgfeh 



" M 2, breadth 



Lower premolar series, length 



" molar series, leDgth 



"■ PI, length 



" P3, " 



" P3, " 



" P4, " 



" Ml, " 



" M2, " 



" 12, breadth 



A. P. 8. VOL. XIX. 2 U 



No. 10493. 



010 



.005 



.0055 



.010 



.006 



.0065 



.009 



.0035 



.006 



.017 



.0055 



.0065 



.010 



.005 



.003 



No. 10513. 



.010 



.009 

 .0CT7 

 .003 



.016 



.007 



.0095 



.005 



No. 10939. 



0.014 

 .005 

 .0035 

 .025 

 .011 

 .0035 

 .0045 

 .005 

 .009 



?.004 

 .006 

 .008 

 .004 

 .006 



.005 



.005 



.006 



.0095 



.005 



.003 



No. 11012. 



0.044 

 .005 

 .003 



.010 



.003 

 ?.004 



.0095 



.0055 



.006 



.008 



.004 



.0055 



.021 



.017 



.003 



.005 



.006 



.0065 



.010 



.005 



.0035 



0.0435 

 .003 



.023 



.010 

 .003 

 .0045 



.0085 



.005 



.006 



.003 

 .004 

 .019 

 .015 

 .003 

 .004 

 .005 

 .006 

 .009 

 .0045 



No. 11432. 



0.0435 

 .0045 

 .003 

 .025 

 .010 

 .003 

 .003 

 .0055 

 .009 



.006 



.003 

 .005 



