1915.] Matthew and Granger, Lower Eocene Wasatch and Wind River Faunas. 461 
There 1s no evidence as to the premaxillary teeth in any of our specimens. 
By analogy with Tarsius I suppose it probable that there was one enlarged 
incisor, and that probably the others were suppressed, as the lower front 
teeth are more specialized than in the modern genus. The premolars are 
very wide transversely with large deuterocones, especially on p*, rudimentary 
stylar cusps and strong anterior and posterior cingula. The molars are 
also very wide transversely, with 
rudimentary hypocones, small 
conules, no mesostyle; the para- 
style rudimentary. The _ third 
molar is much reduced and has 
only the three principal cusps. 
Observations upon referred spec- 
umens. In the second specimen, VP 
No. 41, p*-m? are preserved, with i COs ro 
part of the canine alveolus. It or. 
agrees quite nearly with the Mo.#l A. 14. 
type, save that the hypocones 
appear slightly less prominent. 
Two other upper jaws are like- 
wise in close agreement. In No. 
41 and No. 15063 upper and lower 
teeth of the same individual are 
associated. Nos. 42, 15064-5 and Fig. 31. Tetonius homunculus (Cope), lower 
15693 are lower jaws with from  j@W: inner and crown views, from No. 41; and 
crown view of upper teeth, from type specimen, 
two to five cheek teeth preserved. Gray Bull beds, Bighorn basin, Wyoming. 
All agree quite closely in the cor- 
responding parts. In No. 15064 the alveoli of the large anterior tooth 
(canine?) and a small one behind it are shown, followed by ps—mg well pre- 
served. In No. 41 p3-ms; are preserved, in front of them is a small alveolus 
and in front of that a large alveolus close to the symphysis. ‘The propor- 
tions and relations of this enlarged front tooth, which I regard as probably 
a canine, appear to be the same as in the smaller species 7’. ambiguus in 
which its root is preserved. The lower jaw is deeper and heavier in the 
symphyseal region than in Anaptomorphus or other genera with small front 
teeth, but not as deep as in T’rogolemur. 
P. is a very small one-rooted tooth, but is not preserved in any of our 
specimens. Ps; and py, are robust crowded teeth ridged antero-internally 
and postero-externally, with rudimentary deuteroconid on pu, short wide heels 
on both. Ps; has two connate roots much compressed antero-posteriorly; 
in p: they are more distinct and less compressed. The premolars are. 
\ Myr NN’; | 
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