the Marsh Collection, etc. 



431 



larger than N. latidens, but possesses the narrow tubercle 

 on the external base of the protoconid which is a charac- 

 teristic of that species. It, however, lacks the small 

 tubercle just anterior to the base of the entoconid which 

 is often present in specimens from the John Day Valley, 

 Oregon, referred to Cope's species. The paraconid is 

 the largest cusp of M 2 , with the protoconid and hypoconid 

 of about equal dimensions. The entoconid is small. 

 There is a small tubercle or cusp developed on the pos- 

 tero-external base of the protoconid. From this it will 

 be seen that the tooth patterns of both Mj and M 2 are 

 quite similar in certain respects. M 3 was one-rooted. 



Fig. 3. 



Fig. 3. — Nothocyon latidens multicuspis, subsp. nov. Holotype. X 3/2. 

 A, Occlusal view of molars; B, external view of right ramus. 



Ill 1907, Matthew called attention to a form "approach- 

 ing N. latidens in size and characters" from the Lower 

 Miocene of South Dakota, which he considered would 

 prove to be a new species. The Yale specimen exceeds 

 N. latidens in size, whereas I believe Matthew's specimen 

 is smaller than the type of Cope's species. 



The type locality for A", latidens is in the John Day 

 Valley, Oregon, while this new subspecies is from 

 Nebraska, Furthermore, Cope's species is Upper Oligo- 

 cene (middle John Day) and the new form Lower or 

 possibly Middle Miocene. Unfortunately we can not be 

 positive either of its exact locality or geologic horizon. 

 The reason for this is that the Yale College Scientific 



