440 Bulletin American Museum of Natural History. [Vol. XXXIV, 
nearly, although slightly larger. This in turn agrees rather closely with 
P. nunienus, founded by Cope in 1887 on a lower jaw from the Lost Cabin 
beds. Cope in 1885 referred this Wind River species and also several jaws 
from unknown levels in the Bighorn basin to 
P. frugivorus. Osborn in 1902 retained the 
Bighorn specimens in P. frugivorus but sepa- 
rated P. nunienus and referred it to Notharctus. 
It is certain that two and probable that 
three different species have been included 
under fraugivorus. Specimens from the lower 
Gray Bull horizon have no hypocone on the 
upper molars; in those from the Lost Cabin it 
is very prominent. There is indeed no cer- 
oS so anes ee tainty as to which form is cospecific with the 
and crown of teeth. Upper type of P. frugivorus; but as the fauna of the 
aie ok ee aaa ‘an lower beds of the Gray Bull seems to be older 
| than any of the New Mexican Wasatch, I think 
it unlikely that the Pelycodus of this horizon is identical with Cope’s type; 
and if the latter came from the upper beds, as No. 16209 may indicate, it 
is much more likely to be identical with P. nunienus or to be a primitive 
mutant of it. Loomis in his review of the Wasatch and Wind River 
primates noted differences between the Wasatch and New Mexican speci- 
ae 
ees 
WOLlOGS 2 
Sa liten Sa is 
ee 
wis BX 
Fig. 12; Pelycodus frugivorus, lower jaw, outer view. Mbo-3 are drawn from a second 
specimen found in association. Upper Gray Bull beds, Bighorn basin, Wyoming. 
mens of P. frugivorus to which he assigned varietal value. It appears best 
on the whole to assign to P. frugivorus the specimens from Upper Gray 
Bull and Lysite horizons, and regard nunienus as a more progressive species 
which falls into the genus Notharctus, as does N. venticolus in the lar ger 
series. The specimens from the Lower Gray Bull I have distinguished as 
P. trigonodus. 
To P. frugworus may be referred No. 15625 and other specimens from 
