1915.] Matthew and Granger, Lower Eocene Wasatch and Wind River Faunas. 469 
marginal crest on the basin. ‘The premolars are of wholly diverse type and 
trend. 
It is unfortunate that among nearly one hundred catalogued specimens 
of these two genera not one has any limb or foot material positively associated 
Fig. 39. Microsyops elegans, lower jaw, outer and crown views. Bridger beds (Middle 
Eocene), Bridger basin, Wyoming. 
as belonging to the same individual. Nor is there any such association 
among the specimens of Microsyops in the Yale Museum. Wortman 
arbitrarily referred to this genus an isolated caleaneum of undoubted lemu- 
roid type, and we have several isolated 
caleanea and other foot-bones apparently 
of the same form, as well as a considerable 
part of the hind limbs and feet in associa- 
tion. But for reasons stated. on a preceding 
page I think the genus is more probably 
Hemaacodon. 
Setting aside this evidence there is noth- . 
ing really decisive. The molar teeth are un- 2 Ae pees 
doubtedly like those of Tarsiide and other 
Primates; but they are equally like those of 
Mixodectes and Chriacus, which are not Pri- 
mate. The molariform fourth premolar is es ee 
characteristic of two or three groups of In- — fourth premolar and first and second 
sectivora and is rare among Primates (Gala- ™olars. unworn, inner outer and 
; i crown views. Bridger beds (Middle 
gine only). The double-rooted canine and — focene), Bridger basin, Wyoming 
