38 



PROCEEDINGS OF THE NATIONAL MUSEUM 



nently. This portion of M^ is slightly damaged, but the anterior 

 cinguhim becomes Aveil developed laterally, suggesting a conspicuous 

 parastyle as in T etraclaenodon. The cusps are all low and conical 

 in M- and the lingual portion, as in the type, is somewhat inflated 

 anteroposteriorly, with no cingulum around the inner portion. The 

 hypocone is weak and situated posterior to the protocone. In the 

 early stage of wear represented by this specimen the protocone is 

 seen to be divided, with a slight cuspule immediately adjacent and 

 posterior to the principal cusp. This may have been the case in M" 

 of the type of D. liermaeus^ as indicated by the outline of the worn 

 surface of occlusion. 



Figure 20. — Desmatoclaenus paracreodus, new species: a, M'-M^ (U.S.N.M. No. 16201) 

 type specimen, occlusal view; b, M^-M^ (U.S.N.M. No. 16177), occlusal view; c, lower 

 molar (U.S.N.M. No. 16196), lateral and occlusal views; d, lower molar (U.S.N.M. 

 No. 16194), lateral and occlusal views. X2. a, c, d, Wagonroad Paleocene, Utah; 

 b. Dragon Paleocene, Utah. 



M^ of the Dragon specimen is somewhat distorted, but the cingulum 

 is better developed than in M-. The outer cusps are perhaps more 

 compressed anteroposteriorly and the protocone seems relatively prom- 

 inent. On both molars the enamel is relatively smooth, except for 

 a noticeable rugosity around the lingual wall of the protocone near 

 itg peak. 



Several isolated lower molars, including No. 16194 (fig. 20, d) 

 and No. 16196 (fig. 20, c), from the Wagonroad level are referred to 

 this species, being comparable to those of D. hermaevs in structure 



