PALEOCENE MAIMMALS OF CENTRAL UTAH (iAZIN 



13 



two molars in B. thoinsoni or in B. d'ducvli. However, this tooth, 

 more closely resembles Bessoecetor in its proportions and outline than 

 it does the larger Dragon pantolestid (a). 



DRACONTOLESTES,'' new genus 



Type. — Dracontolestes ayJiantua^ new species. 



Generic characters. — Lingual cusps of lower molars slightly more 

 elevated than outer. Trigouid moderately elevated. Paraconid crest 

 extends to a markedly lingual point. Talonid basin closed lingually. 

 Crest extending forward from hypoconid joins trigonid at a distinctly 

 lateral point. No external cingulum on Mg and M3. 



DRACONTOLESTES APHANTUS,* new species 



Type.—ljsit ramus of mandible, U.S.N.M. No. 16180, with M3 and 

 part of M2. 



Horizon and locality. — Dragon Paleocene, Dragon Canyon, Emery 

 County, Utah. 



Sj)eci-flc characters. — Much smaller 

 than known species of Eudaemonema 

 and Elpidophorus. Teeth about the 

 size of those in Aphronorus simpsoni. 



Description. — The lower jaw with 

 M3 and part of Mo, No. 16180 (lig. 6), 

 represents a species in the Dragon 

 level which is clearly mixodectid, but 

 cannot be certainly referred to any 

 of the known genera. The form is 

 much smaller than species of Eudae- 

 monema and Elpidophorus., being dis- 

 tinctly smaller than Elpidophorus Tni- 

 nor from the Crazy Mountain Fort 

 Union. 



The inner cusps are only slightly 

 more elevated than the outer, such as 

 observed in some material of Eudaemonema cuspidata., not so 

 accentuated in this respect as in Elpidophorus. The trigonid por- 

 tion is elevated with respect to the talonid but the cusps in general, 

 though sharp, are not so elevated as in Eudmmonema cuspidata. 

 The crest carrying the paraconid extends lingually even more than 

 in Elpidophorus patratus somewhat as in Elpidophorus minor., 

 not extending forward or so median in position as characteristic of 

 Eudaemonema. Moreover, the talonid basin is closed lingually by 



Figure 6. — Dracontolestes aphantus, 

 new genus and species: Left ramus 

 of mandible with M2-M3 (U.S.N.M. 

 No. 16180), type specimen, lateral 

 and occlusal views, X 4, Dragon 

 Paleocene, Utah. 



I ipaxtiir, dragon -\- XTjarfis, tblef. 

 * d^avroi, obscure. 



