CANID^. 903 



Three species of the genus are known to me. They may be distin- 

 guished as follows. A fourth species, T. josephi, is provisionally placed 

 with these: 



I. First superior tubercular molar with a wide median fossa, bouuded witbiu by a 



tubercle. 

 Length of suj)erior molar series from cauine, .070 ; of true molars, .0215. 



T. altigenis. 

 Length of molar series from canine, .067; of true molars, .014 T. walloinanus. 



II. First superior tubercular molar with narrower basin, bounded within by a V-shaped 



crest. 



Length of dental series from canine, .055; of true molars, .014 T. coryphwus. 



Length of dental series from canine, .051; of true molars, .013; muzzle narrow, 



zygomaswide. T.josephi. 



All of the above species have been derived from the John Day Miocene 

 beds of Oregon. I, however, anticipate the discovery of these or other 

 species of the genus in the White River beds of Dakota and Colorado. 



Temnocyon altigenis Cope. 



Paleontological Bulletin, No. 30, p. 6 (Dec. 3, 1S78). Proceed. Amer. Phil. See, 1678, p. 63. Bulletin 



U. S. Geol. Suiv. Terrs., vi, p. 179. 



Plate LXVIII, iig. 9; LXX, fig. 11. 



This dog was about the size of the wolf, Canis liqms. It does not ap- 

 pear to have been as abundant as some other species in Oregon, as I have 

 received portions of only three individuals. Two of these are represented 

 by mandibular rami only, one of which is the specimen on which the 

 species was originally established. The third is that part of a skull which 

 is anterior to the orbits, including the mandible and dentition, and it is con- 

 siderably crushed. 



The first-mentioned mandibular ramus is rather deep and compressed, 

 much more so than in the Canis latrans, with which it agrees in the length 

 of the dental series. As compared with the existing species of Canis and 

 Vulpes of North America, the sectorial tooth is relatively smaller and the 

 premolars larger. In this respect it agrees with most other dogs of the. 

 Lower Miocene, and differs from those of the Upper Miocene (Loup Fork).^ 

 The posterior tubercle is wanting from the premolars, excepting the last, 



1 See Proceedings Academy Philatlelphia, 1875, p. 22, where I have discussed the origin and hi^. 

 tory of the sectorial tooth. 



