TRANSACTIONS OF WAGNER 

 114 



UINTA SELENODONTS 



cents like those of Protylopus, which they closely resemble, except that the 

 outer crescents are more concave and the outer buttresses more prominent. 

 The lower premolars, except the caniniform p T and the compressed-conical 

 p-g-, have large inner cusps. The skull is quite like that of Protylopus, but 

 somewhat more massive and with a more elongate muzzle. The cervical 

 vertebra? are of moderate length and the odontoid process is sub-conical, 

 but broad and blunt ; the neural spine of the axis is a very large plate. The 

 lumbar vertebra? are heavy, with large and nearly straight transverse pro- 

 cesses. The bones of the fore-limb are intermediate in character between 

 those of the oreodonts and those of the Camelidce, and the ulna and radius are 

 not anchylosed at any point. The carpus is quite like that of Leptomcryx, 

 but the lunar rests almost equally upon the magnum and unciform. The 

 manus is tetradactyl and resembles that of Protylopus, but the lateral meta- 

 carpals are less reduced and the median pair less enlarged. The pelvis, femur, 

 and tibia are much like those of Protylopus, but the cnernial crest of the latter 

 is far less prominent. The fibula has a very slender shaft, though it is not 

 filiform, as in the last-named genus. The pes has a general resemblance to 

 that of Protylopus, but the lateral metatarsals are not nearly so much reduced. 



21. Lcptoreodon may be regarded as the probable ancestor of Protoceras. 



22. Camclomeryx (Uinta) has a dentition like that of Leptoreodon, except for 

 the smaller upper incisors, which are reduced to two. The skull also resembles 

 that of the latter genus, but has a narrower and less capacious brain-case, 

 deeper postorbital constriction, and much longer sagittal crest, and the orbit is 

 quite far forward. The skull is much like that of Lcptomeryx. Limb-bones 

 referred, though with some doubt, to this genus show an anchylosed ulna and 

 radius; the tetradactyl manus is much like that of Lcptomeryx, but the lunar 

 rests largely upon the magnum, which is separate from the trapezoid, and the 

 lateral metacarpals are less reduced. The pes resembles that of Protylopus, 

 and has enlarged median and much reduced lateral metatarsals. 



23. The taxonomic position of Camclomeryx is somewhat doubtful, though 

 it is probably a form nearly allied to the ancestor of Leptomcryx, if not itself 

 that ancestor. 



24. Oromcryx (Uinta) has no diastemata in the dentition, and in the 

 upper molars, especially m- 3 -, the posterior half of the crown is narrower than 

 the anterior half. The systematic position of this genus is quite uncertain. 



25. Buuomcryx (Uinta) is interesting as tending to show that the postero- 

 internal crescent of the tylopodan upper molar is not the hypocone but the meta- 



