1915.| Matthew and Granger, Lower Eocene Wasatch and Wind River Faunas. 453 
If this skeleton belongs to Hemiacodon, it confirms the affinity to Tarsius; 
although much less specialized than that genus it has the same elongated 
tarsals, large opposable hallux and other characters. If on the other hand 
it belongs to Microsyops it would place the lemuroid affinities of that genus 
beyond question and show that it was not related to the Mixodectide. 
The description of this skeleton does not fall within the province of the 
present revision, but it appeared advisable to place on record the evidence 
for its reference to this genus as having an important bearing on the 
affinities of the Lower Eocene primate genera. 
Washakius Lewy 1873. 
Washakius Leipy, 1873, Contrib. Ext. Faun. West. Terrs. (Rep. U.S. Geol. Geog. 
‘Sur. Terrs., Vol. I) p. 123, pl. xxvu, fig. 3; Wortman, 1904, Amer. Journ. Sci., Vol. 
XVII, p. 208, figs. 142-146. 
Type, Washakius insignis Leidy from Bridger formation, Middle Eocene, of 
Wyoming. | | | 
Generic characters: Dentition see Upper incisors and canine small, pre- 
molars of moderate size, p*~* with strong deuterocones. Upper molars of moderate 
transverse width with small conules, rudimentary hypocones, no mesostyles. M# 
Fig. 25. Washakius insignis, lower jaw fragment, inner, outer and crown views. Front 
of jaw restored from No. 12040. Upper Bridger beds (Middle Eocene), Bridger basin, Wyo- 
aming. 
slightly reduced. Lower molars with distinct median paraconid and distinct 
metastylid; ms with distinct entoconid and double hypoconulid. Lower premolars 
of moderate size, p2 being less reduced than in the other genera, crowded, with 
