1902.] Matthew, Netu Miocene Cantdce. 285 



?? Ursavus sp. 



Another small Amphicyonoid of about the same size as C. 

 saxatilis is indicated by No. 9454, a lower carnassial, and a few 

 fragments from Pawnee Buttes. The tooth is composed of 

 very low trigonid of three cusps, paraconid nearly as large 

 as protoconid, me- well developed, more internal than pos- 

 terior, long basin heel completely enclosed by a well-marked 

 ridge, which begins at the metaconid and swings around the 

 margin nearly to the protoconid, the heel-cusps being scarcely 

 seen. Trigonid is proportioned much as in Ursavus, but no 

 accessory cusps, and heel without well-marked cusps. Trig- 

 onid and especially the protoconid lower than in Amphicyon, 

 and marked basin heel. 



? Cyon or Icticyon sp. 



A palate and a ramus of the lower jaw, both young indi- 

 viduals showing the milk dentition, are referred here. The 

 permanent sectorials are formed within the jaw, but not ex- 

 truded. The character of the milk dentition proves that the 

 specimens belong to the Canida, but to the division of the 

 family with most highly secant teeth. This is confirmed by 

 the metaconid; in the superior one the deuterocone is minute, 

 and there is no anteroexternal cusp. I am unable to make 

 comparisons with the milk dentition of either Cyon or Icticyon; 

 the permanent upper carnassials differ from the figures of 

 Icticyon and from specimens of Cyon alpinus in the greater 

 reduction of the anterointernal cusp and presence of two 

 strong ridges on the anterior slope of the protocone, diverging 

 from the point, one running to the anteroexternal corner of 

 the base, the other to the base of the anterior internal cusp. 



The permanent incisors are trifid, the lateral cusps being 

 stronger than in any Canid that I have seen, equal almost to 

 the median cusp. The external temporary incisor has but 

 one strong lateral cusp, the external one minute; a posterior 

 cusp is also present. The temporary canine is short and 

 small with prominent posterior ridge. The permanent first 

 premolar is one-rooted, with anterior and posterior cusps and 



