1915.]| Matthew and Granger, Lower Eocene Wasatch and Wind River Faunas. 457 
Type, A. emulus Cope, from Lower Bridger of Wyoming. 
Generic characters: Dentition 2.1.2.3. Upper teeth unknown; lower molars 
wide and short with internal paraconid vestigial on m2, ms unreduced but crown 
unknown, psrobust, smaller than m;, deuteroconid obscure, anterior teeth small, one- 
rooted, canine slightly larger than adjoining teeth, lower jaw short and moderately 
deep anteriorly, enamel not wrinkled. Outer cusps of molars less marginal than in 
preceding genera, more so than in J'elonius and Absarokius. 
I refer to this genus only the type species represented by a lower jaw 
with ps-my and roots or alveoli of the remaining teeth. It appears probable, 
Fig. 29. Anaptomorphus emulus, lower jaw, inner, outer and crown views. Type specie 
men, Lower Bridger beds (Middle Eocene), Bridger basin, Wyoming. 
however, that this genus is:a synonym of Ewryacodon if Wortman 1s correct 
in referring certain lower jaw fragments to that genus. Doctor Wortman 
states that the paraconid is absent on all the molars in Anaptomorphus and 
holds the two genera separate on that ground; but it is certainly distinct on 
m, in the type and vestigial, rather than absent, on me, the apparent absence 
being due to wear. | 
Anaptomorphus homunculus is removed from the genus and made the 
type of Tetonius infra. 
Tetonius gen. nov. 
Type, Anaptomorphus ssa eae re 1882. 
ee, Aig x = 
Generic characters: Dentition 9793: Number and character of premaxillary 
teeth unknown. Anterior lower tooth (canine) much enlarged, rooted, subvertical. 
