302 THE WASATCH AND BKIDGER FATING. 



this tooth to be an abnormal production, and do not propose to include it in 

 the generic diagnosis. I have pointed out a similar example in the inferior 

 dentition of the Coryphodon latidens* 



Dentition below; I. I C. 1 ; Pm.; M. 3; first premolar one-rooted; first 

 true molar with a broad heel, one edge of which is submedian and a little 

 elevated above the other. Last two molars tubercular, the second with 

 conic tubercles in front and a short heel posteriorly. 



This genus appears to be the canine representative among the flesh- 

 eaters of the Eocene, as Oxyoena is the feline. There is no more reason for 

 suspecting it of Marsupial affinities, as is suggested by Leidy, than in the 

 case of any others of the Creodonta. The fact that the well-preserved infe- 

 lior border of the ramus of the M. edax is not inflected, is evidence to the 

 contrary. 



The five species of Miacis diff"er in their measurements as follows : 



That of M. vorax is derived from Leidy; those of M. edax from the typical 



specimen, which Professor Leidy kindly lent me. 



a Last inferior molar with two roots. 

 Length of inferior molar series, M. .042 ; of true molars, .020 ; depth of 



ramus at M. II, .016 M. canavua. 



Length of inferior molars, .037; of true molars, .018; depth of ramus at 



M. II, .013 M. brevirostris. 



a a Laiit inferior raolar with one root. 

 Length of last three molars on base, .013; depth of ramus atM. II, .008. M. parvivorus. 

 Length of last three molars on base, .014 ; depth of ramus at M. II, .010. 21. edax. 



Length of last three molars, .017 M. vorax. 



Miacis canavus Cope. 



Bnlletin U. S. Geol. Surv. Terrs., vi, p. 189, February 26, 1881. 



Established on the mandibular rami of two individuals, which display 

 the roots and some of the crowns of all the teeth exclusive of the incisors. 



The root of the canine indicates that the crown is of large size and 

 compressed at the base. The first premolar is one-rooted, and is separated 

 from the second by a short diastema. The second has two well-distin- 

 guished roots, which are separated from those of the third by a diastema 

 like that in front of them. Posterior to this there are no diastemata. The 



•See Report Cnptnin Wheeler's Expl. 8nrv. W. of 100th Mer., iv, pt. ii, p. 215. 



