1915.| Matthew and Granger, Lower Eocene Wasatch and Wind River Faunus. 30 
M. parvivorus of the Lower Bridger, considerably less than in the later 
species of the genus, but more than in the Lower Eocene species hereafter 
Fig. 27. Miacis, lower jaws of two Lower Eocene species. Above, M. latidens type, 
Lost Cabin beds, below, M. exiguus, No. 15717, Upper Gray Bull beds; intermediate M. 
latidens mut. prim., No. 15177, Lower Gray Bull beds. All natural size. 
referred to Vulpavus and decidedly more than in the Middle Eocene typical 
species of Vulpavus. 
Miacis exiguus sp. nov. 
Type, No. 15176, palate, part of lower jaw and fragmentary skeleton; paratypes 
Nos. 15717, 15718, lower jaws, all from the Gray Bull beds, Big Horn Basin, Wyoming. 
Distinctive characters: Pi-m3 = 38 mm.; my_3 = 13. P* and m; carnassiform, 
parastyles of m!~ extended, upper molars with cingulum continuous around proto- 
cone, heavier posteriorly but not forming a hypocone. Parastyle of pt minute. My, 
with high trigonid and basin heel; me with low trigonid but not completely tubercular ; 
m; tubercular, oval with trigonid cusps distinct, small basin heel and roots imperfectly 
separate. Premolars rather short, high, compressed with minute anterior and pos- 
terior basal cusps, and a small posterior accessory cusp on ps. PP: one-rooted; pz» 
spaced. 
This is the smallest of the Lower Eocene Miacidze except V2verravus 
acutus and dawkinsianus. Fragments of the skeleton associated with the 
