534 THE WASATCH FAUNA. 



two of them in place in an incomplete premaxillaiy bone. None of the 

 bones of the skeleton were obtained, so far as known. 



The ramus of the mandible is both robust and deep. Its inferior bor- 

 der does not rise posteriorly so much as in some species, as e. g., C. latidens, 

 and the ansrle is well below the horizontal line of the dental alveoli. The 

 dental foramen is just about in this line. The inferior premolars and mo- 

 lars do not differ from those of several other species, but tlie last molar has 

 several peculiarities. The external cusp is the only one of the posterior 

 pair which is present. It gives origin to two crests, both of them curved. 

 The posterior represents the usual posterior transverse crest, but is gently 

 convex backwards, and turns forwards on the inner side of the crown, only 

 terminating at the external base of the anterior cross crest. The other 

 curved crest is low, although higher than in most species, and extends to 

 the middle of the base of the anterior cross crest. There is a distinct heel 

 which is elevated at the middle and disappears gradually at each end, not 

 being abruptly incurved as in C. anax. The anterior part of this tooth is 

 as peculiar as the posterior. The external cusp gives origin to three crests, 

 two of them the usual limbs of the anterior V ; while a third descends to 

 the anterior border a little exterior to its middle. It incloses a deep groove 

 with the anterior ridge of the anterior V. This arrangement is not seen in 

 any other species. 



The inferior canine is robust, and has its anterior angle prominent, but 

 not alate. The crowns of the inferior incisors are regularly convex exteri- 

 orly, and have no cingula. They are regularly graded in dimensions. 



The superior molar preserved is probably the penultimate. Its ante- 

 rior portion is broken. The posterior external V is narrower tlian usual for 

 a second molar, and resembles somewhat that of the last superior molar of 

 the Manteodon subquadratus. A slight contact face on the posterior cingu- 

 lum shows that this tooth is not the last molar. The said cingulum extends 

 to the external base of the V; in rising to the internal cusp it forms a sig- 

 moid curve. The cingulum below this, on the inner base of the crown, is 

 rudimental. The superior canine has a long and I'obust crown, with a trian- 

 gular section to the apex. The posterior face is a little wider than the other 



