1915.] Matthew and Granger, Lower Eocene Wasatch and Wind River Faunas. 57 
and. of little height. The mesocuneiform is somewhat oblique but lacks 
the extreme obliquity of Vulpavus; the entocuneiform is deep, high and not 
wide, the first digit has a slightly saddle-shaped facet, but does not seem to 
have been at all opposable. 
The symmetry of the digits is not fully mesaxonic; mt.V is intermediate 
in length between mt. IV and I. The metapodials are rather short and 
spreading; the proximal and median phalanges are much broader than in 
Miacidee, somewhat asymmetric but not excavated. The ungual phalanges 
are strongly curved, uncompressed, and rather deeply fissured at the tips. 
The lumbar, posterior dorsal and anterior caudal vertebrae have deeply 
concave zygapophyses. The pelvis is moderately expanded above the 
iliac bar; the ischium is long and broad with the spine expanded into a — 
considerable plate. The sacrum appears to consist of but two codssified 
vertebree, the third in this young individual being still separate, although of. 
sacral type. | 
Palzonictis. 
A number of upper and lower jaws of this genus were obtained in the Big 
Horn Wasatch, and a few skeletal fragments, but nothing to supply much 
information as to the skeleton, and nothing as good as the fine specimen of 
P. occidentalis obtained by Wortman in 1891 and described in the Museum 
Bulletin in 1892. As shown clearly in the 1891 specimen the second lower 
molar of Paleonictis is a reduced copy of the first, with tricusped trigonid, 
and fairly large basin heel. ‘The second upper molar 1 is a small rounded 
one-rooted tooth, not transverse. 
The species of Palewonictis and Ambloctonus are readily distinguished 
from those of Oxyena by the more massive premolars, transverse width of 
upper p*, m! with higher and more pointed cusps but less perfect shear, the 
smaller trigonid and larger heel of m; and reduction of mZ. M! is developed 
as a carnassial as in Oxyena, but to a less extent. In this feature lies an 
obvious reason for associating these genera with Oxysenidee and not with the 
Eucreodine group. While in Paleonictis the second upper molar is ves- 
tigial, in Ambloctonus it is transverse, and in other respects this genus une : 
the better known Paleonictis to Oxyena. 
? Paleonictis sp. 
To Palewonictis may be referred with much hesitation a specimen from 
the Gray Bull beds, No. 15217, consisting of the greater part of the hind 
foot, three caudal vertebree and a few other fragments. It is of larger size 
