﻿BOYSEN RESERVOIR VERTEBRATE FOSSILS — ^^VHITE 195 



Genus DIDYMICTIS Cope 



DIDYMICTIS ALTIDENS Cope 



U.S.N. jSI. No. 18447, skull with Ccilvuriuin and occiput eroded away, 

 ii<,dit and left P'-M- present (loc. No. 48FR75) . 



This specimen tliffers from the one (ignred by Matthew (1915a, \). 

 23) in that P^ is '2-rooted, and there is no diastema between it and the 

 canine. The parastyle on W is better developed and the internal 

 iinglum is continuous. W has a greater transverse diameter for its 

 length and is more advanced. 



MEASUREMENTS OF TEETH OF DIDYMICTIS ALTIDENS (IN MILLIMETERS) 



Lcnyili. Width 



p'-^r jr 58.5 



P^-M- 29.5 



M' 9.0 17.0 



M= 5.0 9.0 



Genus MIACIS Cope 



MIACIS cf. LATIDENS Matthew 



U.S.N.M. No. 18448, right maxillary fragment with M' -, roots of 

 P*, and associated skull fragments (loc. No. 48FR80). 



This specimen is intermediate in size between the types of .1/. 

 cxiguus and latidens (Matthew, 1915a, p. 33-35). It agrees with the 

 former in the extended parastyle en the upper molars and with the 

 latter in that the paracone is much larger than the metacone. The 

 internal cingulum is interrupted medially below the protocone. Mat- 

 thew (1915a, p. 33) states that it is continuous in both species but the 

 illustrations show it to be the same as in this specimen. Although 

 M^ shows considerable wear, there is a suggestion of a small hypocone, 

 and this specimen may be prophetic of }[. parrirorus of the Lower 

 Bridger. 



MEASUREMENT OF TEETH OF MIACIS CF. LATIDENS (IN MILLIMETERS) 



Length Width 



l'*-U"- 16.5 



P' 7.7 



M' 6.0 8.4 



M- 4.0 8.0 



Genus VULPAVUS Marsh 



VULPAVUS AUSTRALIS Matthew 



U.S.N.M. No. 18449, left mandibular fragment with Mi^, (loc. No. 

 48FR76). 



This specimen does not permit anything to be added to INIatthew's 

 (1915a, p. 39) discussion of the species. 



