1915.] Matthew and Granger, Lower Eocene Wasatch and Wind River Faunas. 481 
nected in a heavy curved crest sweeping around the posterior side of the 
tooth as far as the posterior base of the metacone. 
The tooth construction has a very marked resem- 
blance to that of Paramys, but in that genus the 
posterior crest ends internally in a distinct hypo- 
cone in the flank of the protocone; there is a 
heavy anterior cingulum, a distinct metaconule, 
and a metastyle. More important than these 
features is the position of the base of the zygoma, 
which in Paramys as in all rodents springs from 
the anterior end of the row of cheek teeth, whereas Wee VEIE? 
° ° e Onno A. S47. 
in the present specimen it clearly originates from 
the posterior part and projects backward, as it Fig. 50. = Phenacolemur 
: . precox, fragment of upper 
normally does in mammalia. jaw with first. pnd second 
Although these molars are not associated with molars, outer and crown 
views. Base of Gray Bull 
lower teeth of Phenacolemur, they accord very eds, Clark Fork basin, 
well with the inferential construction of the upper Wyoming. 
teeth of that genus, from the characters of the 
lower teeth, and there is no other known genus of the Lower Eocene to 
which they could belong. They certainly are not rodent teeth, although 
superficially like them. 
Phenacolemur citatus sp. nov. 
Type, No. 15695, a lower jaw from the Gray Bull beds of the Bighorn, Wyoming 
basin. 
Specific characters: Psa-m3 = 11.8 mm. (approx.). Pa smaller; anterior molars 
narrower and more elongate. 
Fig. 51. Phenucolemur citatus, lower jaw, outer view, and crown view of teeth. Type. 
No. 15695, Upper Gray Bull beds, Bighorn basin, Wyoming. 
