32 PROCEEDINGS OF THE NATIONAL MUSEUM vol. &i 



gonid portion appears slightly less inflated anteroposteriorly, per- 

 mitting a somewhat longer talonid basin, suggestive of Litaletes 

 disjunctus but with less acute cusps. Mg also resembles that in 

 Dragon material referred to Jepsenia mantiensis but is distinctly 

 narrower and with somewhat better defined cusps on the crest of 

 the talonid. The third molars, Nos. 16283 and 16285, which may 

 also belong to the same type of condylarth, are reduced in size 

 with respect to the second molar described above but not to the 

 extent shown in E. shepherdi. The talonid basin is more excavated 

 than in E. shepherdi and the hypoconulid is better defined, approach- 

 ing the condition seen in Litaletes^ quite opposed to the reduction 

 seen in ElUpsodon priscus. M3 is appreciably smaller and lower 

 crowned than in Litaletes disjunctus^ and the entoconid is not dis- 

 tinct as it is in the Crazy Mountain form. 



The Wagonroad form, if all the above material can be regarded 

 as representing the same type, appears to be a hyopsodont close to 

 or within the genus ElUpsodon^ but clearly distinct from the Dragon 

 E. shepherdi and the nearly contemporaneous E. priscus from the 

 Puerco. 



The second lower molar. No. 16284, has an anteroposterior diameter 

 of 4.6 mm. and a transverse diameter of 3.9 mm. Mg, No. 16285, 

 is 4.2 and 3.0 nmn., respectively. 



Genus JEPSENIA " Gazin 



JEPSENIA MANTIENSIS " Gazin 



Jepsenia mantiensis Gazin, 1939b, p. 285. 



Jepsenia 7nantiensis, from the Dragon horizon, makes the closest 

 approach to Litaletes disjunctus of the various hyopsodont condyl- 

 arths with which comparisons have been made. The upper molar 

 series designated as the type. No. 15747 (fig. 18) , is only slightly more 

 robust than in the Montana form. M^ has about the relative propor- 

 tions of that in L. disjunctus and shows a distinct hypocone about 

 as in that form. However, the lingual portion of M^ is more ex- 

 panded anteroposteriorly, and the hypocone on this tooth is weaker 

 and represented only by the abrupt termination lingually of the 

 posterior cingulum. Also, the midportion of the posterior cingulum 

 on both M^ and M^ is not deflected upward toward the root portion 

 of the teeth so much as in L. disjunctus. The cusps in the upper 

 molars have a more nearly conical appearance, especially the pro- 

 toconule and metaconule. Moreover, the protoconule and metaconule 

 are distinctly better developed. A parastyle and mesostyle are pres- 

 ent, more noticeable in M^, although the cingulum is not so extended 



" Named for Dr. Glenn L. Jepsen. 



" Named for the Manti National Forest. 



