PALEOCENE MAMMALS OF CENTRAL UTAH GAZIN 



27 



An M3, No. 15752, in the collection, possibly belonging to this^ 

 form, does not so closely resemble P. op?sthactos. The paraconid.. 

 though low, is placed more internal than is usual in the Torre j on 

 form. INIoreover, the entoconid is not so simple as usual in P. opis- 

 thacus, exhibiting three small cusps in this position, and the hypoconu- 

 lid is more distinctly separated from the hypoconid. 



Tabs^ 2. — Measurements {in millimeters) of upper and lower teeth of 

 Dracoclaenus griphus 



OXYTOMODON "-' new genus 



Type. — Oxytomodon perissum, new species. 



Generic characters. — Lower teeth slender with cusps high and 

 distinct. Paraconid on M. and M3 lingual in position and close to 

 metaconid. Cingula absent or weakly developed 

 and no crest from paraconid to lingual surface 

 as in Oxyacodori. Hypoconulid less developed. 

 M3 unreduced. 



OXYTOMODON PERISSUM." new species 



Type.—L^ii M^ and M3, U.S.N.M. No. 16183. 



Honzon and locality. — Dragon Paleocene, 

 Dragon Canyon, Emery County, Utah. 



Specific characters. — Near Oxyacodon pris- 

 cilla in size. 



Desanption. — A jaw fragment, No. 16183 

 (fig. 15), with M2 and M3 and three additional 

 specimens, which include only M3, represent in 

 the Dragon fauna a hyopsodont condylarth 

 near Oxyacodon. Oxytomodon perissum is 

 near Oxyaxiodon priscilla in size, but the para- 

 conid on the lower molars is lingual in position, 

 close to the metaconid, and does not exhibit a 



Figure 15. — Oxytomodon 

 perissum, new genus 

 and species: Fragment 

 of left ramus of man- 

 dible with M2 and M3 

 (U.S.N.M. No. 16183), 

 type specimen, lateral 

 and occlusal views, X 

 4, Dragon Paleocene, 

 Utah. 



12 'o^C'Tciioi, sharp + 'oHov!, tooth. 



iiirtpiaaos, unnecessary or superfluous, in allusion to the considerable variety of small con'lylarths. 



