Eaton — John Day Felidce in Marsh Collection. 429 



article, in his discussion of Hoplophoneus, Matthew notes 

 that Merriam 's Pogonodon davisi, which Matthew had 

 not then had an opportunity to examine, "appears from 

 Merriam's figures to be referable to this genus [Hoplo- 

 phoneus] and distinct from any of the Dinictis phylum.' ' 

 On the other hand, Merriam 7 in his announcement of 

 Pogonodon davisi has stated at considerable length the 

 reasons for which it seemed to him "advisable to use the 

 arrangement proposed by Cope, and to separate platy- 

 copis, bracliyops, and davisi [from the deinictid group 

 in the John Day beds] as the Pogonodon group, of at 

 least subgeneric rank." In this status Pogonodon has 

 rested for several years. My colleague M. R. Thorpe 8 

 has recently found it expedient to recognize the validity 

 of Cope's Pogonodon in order satisfactorily to record 

 the affinity of a feline mandible from the White River 

 beds of South Dakota. Similarly in the case of the skull 

 about to be described, the practical convenience of 

 retaining Pogonodon as a distinct genus, or subgenus, 

 is not to be denied. 



Pogonodon serrulidens, sp. nov. 



(Figs. 1-3.) 

 Holotype, Cat. No. 10520, Y. P. M. Upper Oligocene (John Day), Turtle 

 Cove, John Day Valley, Oregon. Collected by L. S. Davis in 1875. 



The type material consists of a cranium, not particu- 

 larly well preserved, together with two fragments of 

 the right mandibular ramus, the proximal portion of the 

 right ulna, and the proximal portion of the left metatarsal 

 III. From the indications of age afforded by the sutures 

 alone, this skull would appear to be that of an animal 

 nearly or quite adult, but the dentition proves that the 

 animal was immature. The permanent premolar and 

 molar series is, or was, complete, while the deciduous 

 canine of the left side is still present, being but partly 

 overlapped, on its inner side, by its permanent successor. 

 On the right the deciduous canine has been lost with 

 part of the maxilla, so exposing considerably more of 

 the permanent canine than the portion that had actually 

 protruded beyond the parapet. The premaxillary 

 alveolar border has been damaged, and none of the 



7 J. C. Merriam, Univ. of Calif., Bull. Dept. Geol., vol. 5, 57, 1906. 

 8 M. E. Thorpe, This Journal (4), 50, 223, 1920. 



