20 PROCEEDINGS OF THE NATIONAL IVIUSEUM vol.91 



Considerable doubt attaches to the assignment of any upper teeth 

 to this species. Those tentatively assigned to P.f spiekeri may be- 

 long to P. hiatheles,' however, the reduced size of M3 suggested in 

 the type of P.f spiekeri indicates allocation of the preserved third 

 upper molars to that species. 



PROTOGONODON? species 



A maxillary portion, No. 16193 (fig. 11), including IVP and a 

 much damaged M", in the Wagonroad collection strongly resembles 

 material in the Dragon collections referred to Prolog onodon? spiek- 

 eri. M? is rounded and the cingulum, which 

 appears to extend entirely around the tooth, is 

 rugose, whereas the central basin is smooth. 

 Arising from the cingulum is a hypocone about 

 as in the Dragon M^ but between the paracone 

 and metacone and separate from the cingulum a 



Figure 11. — Protogon- -, , j_ i • i 



d n? s ■ Left max- mucli-worn accessory cuspule or mesostyle is de- 



illary portion with veloped to an extent approaching that in Deu- 

 M* and part of M^ terogonodon montanus. In M^, No. 15733, re- 

 (U. S. N. M. No. f erred to P. ? spiekeri from the Dragon horizon, 

 ^^w^X Ww'^^^n ^^^^'^® ^^ ^ ^^^^^*^ cuspule in this position. 

 road Paleocene '^^^^ anteroposterior and transverse diameters 



Utah. of M% No, 16193, are about 9.5 and 10.5 mm., 



respectively. 

 Other incomplete portions of teeth in the collections from the 

 Wagonroad horizon probably represent the same form as No. 16193, 

 or a closely related type. All show evidence of a moderately heavy 

 cingulum but none of the upper tooth fragments exhibit a mesostyle 

 as in No. 16193. 



A single last lower molar, No. 16344, in the small collection from 

 the original Wagon Road Ridge locality (the equivalence of which 

 to either the Wagonroad or Dragon horizons is uncertain) may repre- 

 sent a species of Protogonodon. The elevation of the trigonid sug- 

 gests Eoconodon but differs from that form in having the paraconid so 

 nearly median in position. 



Genus OXYCLAENUS Cope 



OXYCLAENUS PEARCEI.s new species 



Type. — Portions of right and left rami of the mandible with M2 

 and M3, U.S.N.M. No. 16186. 



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

 County, Utah. 



* Named for Franklin Pearce, in recognition of his field assistance. 



