Loomis — Wasatch and Wind River Primates. 283 



medianly. It is fairly common in the Bridger Creek beds, 



5 



Fig. 5. Pelycodus nuniensis Cope, x 2. 



eight specimens being found. The last three molars measure 

 16 mm in length and 3-| mm in width. 



JSTotharctas rninutus sp. nov. 



This, the smallest species of the family, is founded on a right 

 mandibular ramus, containing the molars and the roots of the 

 third and fourth premolars, found in the Wind River beds on 

 Bridger Creek, Wyoming. 



The low teeth have rather acute cusps, those on the trigonid 

 being higher than those on the talonid. The external cusps 

 are strongly crescentic. The paraconid is moderately strong, 

 and stands well to the inner margin of the tooth. There is a 

 strong protolophid but no metalophid, so that there is a basin 

 on the trigonid as well as on the talonid. The heel of the last 



|p#« 



r 



Fig. 6. Notharctus minutus, type, x 5. 



molar is surrounded by a raised rim on which there are no 

 cusps. There is a strong external cingulum on all the molars. 

 The form is a tiny one, and the jaw very slender. 



The crescentic cusps, lack of a metalophid, and the basin on the 

 trigonid causes the species to strongly resemble the European 

 genus Adapis. Three specimens were found on Bridger 

 Creek. The three lower molars together measure 5 mm in length. 



Notharctus palmeri sp. nov. 



This small form is abundant in the Wind River beds of the 

 Bridger Creek exposure. The type is two fragments of the 

 lower jaws of one individual, the one containing the left fourth 

 premolar, the other carrying the second and third molars of 

 the right side. The species is named for W. W. Palmer on 

 account of his success in collecting in these beds. 



