O. C. Marsh — Description of Tertiary Artiodactyles. 269 



Parameryx Icevis, sp. nov. 



The second genus of selenodont ungulates referred to in the 

 address quoted is quite distinct from JEomeryx, but is known 

 from less perfect remains. It may readily be distinguished 

 from that genus by the upper molars that lack the extra fifth 

 cone, and by the slender, compressed lower jaws, without a 

 caniniform first premolar. The limbs and feet, also, show 

 important differences. In the hind feet, there were but two 

 functional digits, although the second was present in a reduced 

 form. An upper molar and the astragalus of this species are 

 shown in figures 20 and 21. 



In size, the present species was smaller than the type of 

 Eomeryx, and of more slender proportions. There appear to 

 be one or two species of the present genus besides the type. 

 One of these may be distinguished by the lower jaws, which 

 have a deep groove on the inner face of the ramus, extending 

 forward nearly to the symphysis. This form may be known 

 as Parameryx sulcatus. 



In the address already quoted, this genus was regarded as 

 possibly related to the Camels and Llamas, but until additional 

 remains are found, its exact affinities must remain in doubt. 



In the two publications above cited, Scott and Osborn have 

 given the name Leptoiragulus to certain Artiodactyle remains 

 from the Uinta deposits, but it does not appear from the 

 descriptions or figures, that the specimens described are dis- 

 tinct from those on which the genus Parameryx was estab- 

 lished. Some of them are apparently identical, although the 

 species may be different. Others may pertain to Oromeryx, a 

 genus certainly distinct from Leptotragulus, as described. 



Oromeryx plicatus, sp. nov. 

 23. 



Figure 23. — Upper teeth of Oromeryx plicatus, Marsh ; seen from below. 

 Natural size. 



The third genus of Artiodactyles with selenodont dentition 

 found in the Uinta basin by the writer, and noticed in the 

 address above quoted, is Oromeryx. This genus is represented 

 by numerous remains, many of them in good condition, which 

 afford characters for distinguishing it from those above described. 

 They represent, moreover, animals somewhat smaller in size 

 than those already noticed, and of proportions still more 

 delicate. 



