CREODONTA. 339 



separated, and the intermediate areas are distinct. There is a cingulum all 

 round the crown of the last two, and round that of the first, except at the 

 'inner side, and at the anteroexternal angle. 



The last three inferior premolars are higher than long at the base, and 

 are compressed, and the apex acute. The posterior edge of the third and 

 fourth is truncate, and simple. Each has a posterior cingulum which forms 

 a narrow heel on the fourth. No other cingula. Of the true molars only 

 the second is wanting. The form of these is like those of the M- ferox, with 

 the cusps more prominent. The first only has trace of the anterior V; in 

 the others, the two anterior tubercles ai'e opposite and connected by a short 

 anterior ledge. The heel of the first consists of a basin bounded by three 

 tubercles, of which the external is pyramidal and largest. The median 

 posterior is small. The heel of the third is narrow and prominent, and the 

 internal lateral tubercle is represented by a short raised edge. The enamel 

 of all the molars is wrinkled, and the inner side of the premolars is grooved 

 with the height of the crown A weak external cingulum on M. iii. 



Measurements. 



M. 

 Length of last three superior molars 0265 



Diameters of M.i I ^"t'^^P^^t^""' °°^ 



< transverse UUbO 



_. . „ ,, ..(anteroposterior 0062 



Diameters of M. n{ ' .„_- 



( transverse Wli 



_. „ ,, ..< anteroposterior 0047 



Diameters of M. lu < '^ „„„,, 



( transverse uubO 



Length of last inferior molars - - -0340 



Length of last three premolars 0140 



Length of P-m. iv 0050 



Elevation of P-m. iv 0050 



_. , „ ,, .(anteroposterior 00.57 



Diameters ot M. i < , ,^.„ 



( transverse - - uu4<j 



Diameters of M. iii ^^"t*^°P''«t''"°'^ ^°!? 



< transverse uUi» 



Rather larger than the pine weasel, Mustela americana. 



MlOCL^NUS MANDIBULARIS CopC. 



American Naturalist, 1881, p. 831, Sept. 22, 1881. Paleontological Bulletin, No. 33, p. — . 



Plate LVIIf; fig. 7. 



The typical specimen of this species is represented by two fr-agments 

 of the left mandibular ramus which were apparently found together, but 

 which do not fit, owing to the loss of an intermediate fragment, and accu- 

 mulation of hard ferruginous stone. That they belong to the same ramus 



