536 THE WASATCH FAUNA. 



C. molestus. It is only represented by the superior canine, first inferior pre- 

 molar, and last superior molar of one individual found together by Mr. Wort- 

 man. Their size, mineral condition, and degree of wear render it probable 

 that all belong to one individual. 



The sviperior molar is of the oval type, without posterior shoulder. 

 The posterior crest is therefore straight, and parallel with the anterior crest. 

 Its inner extremity does not display the least tendency to form a V, as is 

 seen in C. elephantopus. Its exterior extremity is widely separated from the 

 external prominence of the anterior crest (cingulum). The latter displays, 

 at its inner extremity, the peculiarity of a deep fissure of the anterior side, 

 which nearly divides the crest, and partially isolates the internal tubercle. 

 Adjacent to the fissure its crest is tuberculate. The posterior upper cingu- 

 lum descends from the inner cusp to the basal cingulum. The basal cingu- 

 lum is well developed on the anterior and interior sides of the crown, and 

 on the posterior as far as the base of the inner cusp of the posterior crest, 

 where it gradually fades out. Enamel wrinkled. 



The superior canine is remarkable for its small size. The posterior 

 face is a little the widest, and its bounding edges are sharp, but not ex- 

 panded. There are no prominent ridges of the enamel. The anterior face 

 is moderately wide. The first inferior premolar presents no peculiarities. 



Measurements. 



M. 



( anteroposterior 028 



Diameters of M. iii 8uperior< transverse 038 



( vertical 019 



Diameters of Pm.i inferior 5 ^'^t"°P°«**="''^--. ^J^ 



< transverse posterior UU9 



DiametersofC. superior 5 '^"teroposterior.. 014 



( transverse posterior 018 



The superior molar is but little worn, and shows that the animal was 

 just adult. The canine is more worn than the molar. 



There are several characters which mark this species as distinct from 

 those previously known. It is the only member of the genus which has a 

 complete internal cingulum. The fissure of the anterior crest, if normal, 

 is peculiar to this species. The superior canine is disproportionately 

 small. 



Big-Horn "Wasatch, Northern Wyoming. 



