912 THE JOHN DAY FAUNA. 



much smaller in the living species, the angular and coronoid processes less 

 developed, and the condyle less extended transversely. The cranium of the 

 I. crassivuUus is much more robust, but not much longer than that of /. 

 venaticus. 



Discovered by Mr. J. L. Wortman in the John Day beds of the John 

 Day River region of Oregon. 



HYAENOCYON Cope. 



Palseoutological Bulletin No. 31, 1879, p. 3 (Dec. 24) {dejinitione falsd) ; Proceedings American Philo- 

 sophical Society, 1879, p. 372 (definitione fahd. American Naturalist June (May 19), 1881, p. 497 

 {dejinitione emendatd). 



This genus rests on the characters furnished by two species, which are 

 represented by but few remains. Its family position is doubtful, and my 

 reference of it to the Canidce is only provisional. It may, so far as the evi- 

 dence goes, be a member of the 3fustelidce or even of the Felidce. 



Dental formula : I. §; C j; Pm. |; M. ^. Last superior molar robust, 

 transverse, like that of the Canidce generally. Inferior premolars all two- 

 rooted, and with well-developed posterior cutting lobe. Inferior sectorial 

 large, with heel. Probably no inferior tubercular tooth. 



The characters above given agree with those of Oligobunis in the su- 

 perior true molars, but differ in the absence of the Pm. I. and the M. II. 

 in both jaws. 



The typical species is tlie Hycenoct/on sedorius {Enhydrocyon hasilatus 

 partim Cope olim.), from the John Day beds of Oregon. 



Hyaenocyon basilatus Cope. 



Bulletin U. S. Geol. Surv. Terrs., vi. 181, Feb., 1881. Enhydrocijon basilatus Cope, Bulletin U. S. Geol. 

 Survey Territories, v. 1879, p. 57. American Naturalist, 1882, p. 246, fig. 13 e. 



Plate LXXV; fig. 3. 



This rare species is certainly represented in my collection by parts of 

 only one individual which is known from the greater part of both rami of 

 a mandible, from which only the sectorial, one canine, and some incisors of 

 one side have been lost. 



These portions indicate an animal of the same general character as the 

 Enhydrocyon stenocephalus, but of larger and more robust proportions, and 

 characterized by many dental peculiarities. These will be at once pointed 



