268 0. G. Marsh — Description of Tertiary Artiodactyles. 



The present genus and species, Eomeryx joumilus, were 

 redescribed by Scott and Osborn, in 1887, under the name 

 Protoreodon pa?'vus (Proc. Amer. Philos. Soc, vol. xxiv, p. 

 257), and later, in 1889, by Scott, more in detail (Trans. Amer. 

 Philos. Soc, vol. xvi, p. 487). No reference was made in 

 either paper to the article by the writer, cited above, relating to 

 the Uinta basin, and the statements made concerning the first 

 researches in the basin are inaccurate. The description and 

 figures are in the main correct. 



20. 



21. 



22. 



Figure 20. — Upper molar of Parameryx /.cevis, Marsh ; seen from below. 

 Figure 21. — Astragalus of same species ; front view. 

 Figure 22. — Lower molars of Eomeryx (Agriochcerus) jmmilus ; top view. 

 The figures are all natural size. 



Hy ornery x breviceps, gen. et sp. 



no v. 



The present genus is nearly allied to Eomeryx, but repre- 

 sents a more specialized form. The skull is shorter, particu- 

 larly in the facial region, but the most important difference is 

 seen in the premaxillaries. In the present type, these are 

 very much reduced, and thoroughly coossified with the maxil- 

 laries. They cover the canines in front, but contain no 

 incisors. The upper canines are smaller than those of Eo?neryx, 

 and the maxillaries containing them are less robust. There is 

 a diastema behind the upper canine, and the molars agree in 

 form with those of Eomeryx. The lower jaws have the full 

 dentition, the first premolar being caniniform, as in Eomeryx 

 and Oreodo?i, but the lower jaws are less massive than in those 

 genera, especially in front. Figure 19 shows the upper teeth 

 of the type specimen. 



There appear to be four functional digits in the fore feet, 

 and the first is probably represented in a much reduced form. 

 In the hind feet, also, there are four functional digits, and a 

 remnant of the fifth is still retained. 



The type specimen of the present genus is from nearly the 

 same horizon as the type of Eomeryx. The present species 

 was about two-thirds the size of Eomeryx jpumilus. 



