64 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 28 



CM. 

 No. 

 3394 

 Type 

 P*, anteroposterior diameter : transverse 



diameter 8.3a : ii.i 



M^ anteroposterior diameter : transverse 



diameter* 



M', anteroposterior diameter : transverse 



diameter 



M^ anteroposterior diameter : transverse 



diameter 



45-7 



Length of lower cheek tooth series, Pi- 



Ms, measured at alveoli 



Lower premolar series, P1-P4, measured 



at alveoli 



Lower molar series, M1-M3, measured at 



alveoli 



Pi, anteroposterior diameter (at alveo- 

 lus) : greatest transverse diameter. . . 



Ps, anteroposterior diameter : greatest 



transverse diameter 



Pa, anteroposterior diameter : greatest 



transverse diameter 10.4 : 6.6 



P4, anteroposterior diameter : greatest 



transverse diameter 11.50 :.. . 



Ml, anteroposterior diameter : transverse 



diameter of talonid 



M2, anteroposterior diameter : transverse 



diameter of talonid 13.8 : 9.9 



M3, anteroposterior diameter : transverse 



diameter of trigonid 21.4 : 9.7 



CM. 

 No. 

 11769 



9.00 : 12.4a 



13.5 : 19.0a 

 14.3:21.0 



U.S.N.M. 



No. 



20390 



84.5 



41-5 



43-3 



10.7 : 8.0 



11.7:7-3 



12.8: 10.2 

 20.2 : 9.9 



CM. 



No. 

 11801A 



9.9: 12.2 

 12.2: 14.0 

 14.4: 16.8 

 15-3: 177 



95-oa 

 51.0a 

 43.4a 



8.3:5.2 

 10.00 : 6.3 

 lo.oa: 7.8a 



12.6: lo.oa 

 21.0: lo.oa 



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 CRASSUS 3^ Scott, 1945 



Type. — Nearly complete skull, CM. No. 2967. 



Horizon and locality. — Randlett member of Duchesne River forma- 

 tion, I mile south of Baser Bend and ^ mile west of Green River in 

 Utah. 



Discussion. — This is evidently a valid and recognizable species. 

 The skull of Diplobunops crassus is more massive and broader than 

 those referred to Diplobunops matthewi. Also, the molar teeth and 

 P* are appreciably larger, although in the anterior premolars this is 



3* Illustrated in Scott, 1945, pi. 4, fig. 3, and pi. 5, figs, i, ib. 



