438 



Thorpe — Some Tertiary Carnivora in 



Amphicyon sinapius Matthew. 



(Figs. 7, 8.) 



In the collection there is a part of a right ramus with 

 the base of P 3 , nearly complete P 4 , and complete M^ and 

 M 2 , a detached crown of a lower canine and a practically 

 complete left superior canine. These bear the catalogue 



wow 



Fig. 7. — Amphicyon sinapius Matthew. X 2/3. External view of part 

 of right ramus. 



number 10010, Y. P. M., and were collected on the Nio- 

 brara River in 1875. The superior canine has the same 

 characters as that of the type of A. americanus. 



There are three molars in the lower jaw, the first two 

 of which are very robust, while the premolars are rela- 



70010 



Fig. 8. — Amphicyon sinapius Matthew. X 2/3. 

 and premolar. 



Occlusal view of molars 



tively considerably reduced as in the superior dentition. 

 The paraconid of M x is reduced, while the protoconid and 

 metaconid are robust and prominent. Of the heel, the 

 hypoconid is by far the more prominent element, for the 

 entoconid is marginal and much reduced. The robust M 2 

 is composed of a large protoconid, a smaller paraconid 



