NO. 8 UPPER EOCENE ARTIODACTYLA — GAZIN 65 



not SO evident. I do not, however, find that the deuterocone on P' is 

 particularly small as noted by Scott. It seems better defined than in 

 the specimen Peterson designated as the type of Diplobunops uintensis. 

 The distinctly less-selenodont character of the teeth in comparison 

 with the more-advanced forms among Protoreodon species is well 

 shown in the type of Diplobunops crassus. 



MEASUREMENTS IN MILLIMETERS OF DENTITION IN TYPE SPECIMEN OF 



Diplobunops crassus, cm. no. 2967 



Length of upper cheek tooth series, C (at alveolus) -M^ inclusive... iio.o 



Length of upper cheek tooth series, P*-M^ inclusive 94.3 



Upper premolar series, P*-P^ inclusive 59.6 



Upper molar series, M'-M^ inclusive 46.7 



C, anteroposterior diameter (at alveolus) : greatest transverse diame- 

 ter 9.5a : 8.50 



P\ anteroposterior diameter : greatest transverse diameter 8.8 : 4.0 



P', anteroposterior diameter : greatest transverse diameter 10.6 : 5.6 



P*, anteroposterior diameter : transverse diameter* 12.0 : lo.o 



P*, anteroposterior diameter : transverse diameter ii.o: 13.8 



M\ anteroposterior diameter : transverse diameter* 13.6 : 16.8 



M^ anteroposterior diameter : transverse diameter 15.7 : 19.7 



M', anteroposterior diameter : transverse diameter 17-5 : 22.3 



a, Approximate. 



* Measurements of posterior upper premolars are taken anteroposteriorly across outer por- 

 tion and transversely perpendicular to outer margin. Those of upper molars are taken 

 anteroposteriorly perpendicular to anterior margin and transversely across anterior portion 

 of tooth. 



DIPLOBUNOPS VANH0UTENI,35 new species 

 Plates 8 and 9 



Type. — Skull, mandible, and other associated skeletal portions, 

 P.U. No. 1425 1. 



Horizon and locality. — Uinta B, White River pocket, Uinta Basin, 

 Uinta County, Utah. 



Specific characters. — Size much smaller than Diplobunops matthewi. 

 Upper canine and Pi almost as large as in D. matthewi. No diastema 

 between P^ and P^. P* with ridges on lingual wall of single primary 

 cusp much subdued. Deuterocone of P* subcrescentic. Upper molars 

 low crowned and transversely very broad, with well-developed styles 

 and moderate ribs. Molar cusps somewhat conical appearing and but 

 weakly crescentic. Lower jaw shallow and lower premolars relatively 

 large and crowded, with P3 and P4 rather distinctly pocketed antero- 

 lingually. Lower molars with comparatively conical lingual cusps, 

 and lingual styles moderately developed only on the metaconid. 



35 Named for Dr. Franklyn B. Van Houten. 



