NO. 8 MAMMALIAN FAUNA, BADWATER AREA — GAZIN 2'] 



These teeth are all of about the size of those in Uintan P . puniilus. 

 There is, moreover, no certain evidence that another species such as 

 Protoreodon primus is not represented. 



PROTOREODON PEARCEI,i3 new species 

 Plate 3, figures 7, 8 



Type. — Skull, jaws, and other portions of skeleton, U.S.N.M. No. 

 20305. 



Horizon and locality. — Hendry Ranch member of Tepee Trail for- 

 mation on south side of Badwater Creek, SW-j sec. 13 near line be- 

 tween sections 13 and 24, T. 39 N., R. 89 W., Wind River Basin, 

 Wyo. 



Specific characters. — Larger and more robust than Protoreodon 

 puniilus, very close in size to Diplohunops matthewi. Marked diastema 

 between canine and P^ 



Discussion. — Although this specimen had been early regarded as 

 Protoreodon primus (see Hough, 1955) it is readily distinguished 

 from this species and the advanced Protoreodon puniilus annectens by 

 its distinctive size. It is much more easily confused with the equally 

 large Diplobunops matthewi. There are several isolated teeth and in- 

 complete dentitions that appear to represent this very large protoreo- 

 dont, but a number, more fragmentary or too well worn, cannot be al- 

 located as between this form and Diplobunops, cf. matthewi. 



The skull of Protoreodon pearcei differs rather noticeably from that 

 of Diplobunops, cf. matthewi in the Badwater collection (see Gazin, 

 1955, pis. 10-12) in the anterior extremity of the rostrum. Although 

 the canines are actually larger and as far apart in P. pearcei, the snout 

 extremity does not appear so bluntly expanded, evidently because the 

 palate is not so noticeably constricted behind P^. There is a diastema 

 between the canine and P^ about the same length as in the Diplobunops 

 specimen but there is no diastema behind P\ and the premolars are 

 distinctly crowded. P^ shows a slight basin posterointernally but 

 no deuterocone. P^ has a smaller deutcrocone but a distinctly better 

 defined basin posterointernally than in the Diplobunops material, and 

 in P* there is clearer evidence of a tritocone. The upper molars show 

 more lingually sweeping outer crescents and the protoconule may be a 

 little weaker. This is particularly true of AP. 



The lower jaw is not so constricted through the symphysial portion 

 as it is in the Diplobunops material figured by Scott (1945, pi. 5, fig. 



13 Named for Franklin L. Pearce, who found the type specimen. 



