304 THE WASATCH AND BKIDGEK FAUNJB. 



unusually large. Mental foramina are below the anterior parts of the sec- 

 ond and fourth premolars, respectively. Last inferior molar small. 



Measurements. 



M. 



Length of molar series 03eO 



Length of premolars OiJOO 



Length of base of fourth premolar 0060 



Length of b;ise of sectorial 0072 



Length of base of first tubercular 0048 



Length of base of second tubercular tKJ42 



Depth of ramus at second premolar t'UO 



Depth of ramus at second true molar 0140 



Wind River beds, J. L. Wortman. 



MlACIS PARVIVORUS CopC. 



Paleontologlcal Bulletin, No. 3, p. 2, Aug. 7, 1872. Proceed. Amer. Philos. See, 1872, p. 470. Viverravu* 

 parrivorus Cope, Pal. BnU., No. 12, p. 3. An. Rep. U. S. Geol. Surv. Terrs., 1872 (1873), p. 560. 



Plate sxiv, fig. 12. 



Established on a portion of the right ramus mandibuli, containing por- 

 tions of three molars, the penultimate being perfect. As in Canidcc, the 

 molars diminish in size posteriorly, the last being single-rooted, the penulti- 

 mate being two-rooted. The structure of that tooth is approximately that 

 of StypolopJms, i. e., •with three trihedral cusps in front and a heel behind, 

 but the cusps are of equal height, and their point of union not raised above 

 the surface of the heel. This is a valley bounded by a sharp margin, which 

 is incurved to the outer cusp, leaving a vertical groove on the outer side, as 

 in Stypolopltus sp. This species is further characterized by the single-rooted 

 small tubercular posterior molar, which is also present in M. edax and 3f. 

 vorax. The antepenultimate molar is much larger than the penultimate. 

 The crown of the latter -is laterally expanded, and bears a cingulum at the 

 base anteroexternally. Enamel smooth. 



Depth of ramus at penultimate molar 0080 



Length of crown of penultimate molar 0040 



Elevation of crown of penultimate molar .' 0025 



Width ol crown of penultimate molar 0033 



Found on Black's Fork of Green River. 



DIDYMICTIS Cope. 



Bystfim. Cat. Vert. Eocene New Mexico, U. S. Gcog. Snrv. W. of lUUth .M., 1870, p. 11. Kept. U. & 

 Goog. Sunr. W. 100th M., vol. iv, part 2, p. 123. 



Inferior molars six, consisting of four premolars and two true molai-s. 

 True molars, a posterior tubercular, and an anteri(u- tubercular-sectorial, 



