28 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I3I 



2). Pi is a very large caniniform tooth, closely followed by the suc- 

 ceeding, noticeably overlapping premolars. I have not observed signifi- 

 cant differences in the lower premolars and molars although from the 

 material at hand the lower cheek teeth of P. peorcei are a little nar- 

 rower than in D., cf. viatthewi. 



Proforeodon pearcei makes a close approach to Agriochoeriis 

 antiqmis in size and in the presence of a short though distinct 

 diastema between the upper canine and P^. There is, however, no 

 diastema between Pi and P2. Moreover, the posterior premolars above 

 and below are not nearly so progressive. Also, the protoconule, though 

 very weak on ]\P, is clearly defined on M^ and M^. 



I am not certain that this species is represented in Uinta collections, 

 but a robust jaw from Leland Bench Draw with closely crowded pre- 

 molars and no diastema between Pi and P2 may represent P. pearcei 

 rather than Diplobunops matthewi. Measurements of this jaw were 

 given (Gazin, 1955, p. 64) in comparison with the type materials, 

 showing the shortness of the space occupied by the premolar sequence, 



Protoreodon pearcei is apparently represented in the Sage Creek 

 area collections by a skull which has the Carnegie Museum number 

 8927. It was collected by J. L. Kay in 1940 and the catalog card 

 carries the information "Spring Gulch, Sage Creek." The information 

 "Oligocene (Cook Ranch) " also appears on the label, but this informa- 

 tion is surely a misinterpretation of the horizon represented. The 

 skull was figured by Hough (1955, pi. 8, fig. 8) as "Mesagriochoerus, 

 cf. primus" and the catalog number is incorrectly cited as "ciSzy." 



Measurements for the teeth in the type of P. pearcei are given with 

 those for Diplobunops, cf. mattheivi in the following section. 



DIPLOBUNOPS, cf. MATTHEWI Peterson, 1919 

 Plate 3, figure 6 



In contrast to the rather small ratio of Diplobunops to Protoreodon 

 specimens encountered in the Uinta basin, Diplobunops is almost as 

 a])undant in the Badwater collection as Protoreodon. Remains of this 

 comparatively large agriochoerid include some of the better preserved 

 materials representative of the fauna and the least distorted known 

 for the genus. Two excellent skulls were collected by Plarry A. 

 Tourtelot, one of these, U.S.N.M. No. 20303, has been previously 

 figured (Gazin, 1955, pis. 10-12). 



The distinction between Diplobunops and Protoreodon on the basis 

 of isolated teeth is difficult to make, particularly in the Badwater 

 materials, because with the recognition of the equally large Pro- 



