1902.] Osborn, American Eocene Primates. 205 



Mixodectes.— J, y, 3. 5, g. One enlarged incisor tooth only; a canine, 

 three to two premolars, fourth premolar pointed; depressed paraconid 

 on the molars, a rudimentary hypoconulid. 



WASATCH. 



Cynodontoinys. — y, y, 5, 3. One enlarged incisor only, two pre- 

 molars, fourth premolar submolariform ; a small paraconid and hypo- 

 conulid on the molars. 



WIND RIVER AND BRIDGER. 



Microsyops. — y, y, ^, 3. Greatly enlarged incisor; two premolars, 

 third premolar further reduced, fourth premolar molariform; a small 

 paraconid on the molars. 



Chronological List of Species. Partly Incert^e Sedis. 



Sp. (51) Mixodectes pungens Cope Torrejon. 



(52) " crassiusculus Cope " 



(S) Microsyops gracilis Leidy Bridger. 



(9) " {Palceacodon) verus Leidy 



(18) " {Bathrodon) typus Marsh 



(19) " {Bathrodon) annectens Marsh 



(20) " (Mesacodon) speciosus Marsh 



(46) " scoitianus Cope Wind River. 



(49) " {Cynodontoinys) latidens Cope, Wasatch. 



(59) Olbodotes copei Osborn Torrejon. 



Compare also Indrodon malaris Cope 



" Chriacus angulatns Cope Wasatch. 



I. Torrejon (Thanetien) Basal Eocene. 



(Sp. 59) Olbodotes copei, gen. et spec. nov. 



Type, No. 2385, Amer. Mus., left lower jaw. 



Dentition. — 3, y, ^, 3, An enlarged median incisor, two smaller in- 

 cisors on the alveolar border behind it; canine small; third premolar 

 reduced; fourth premolar high, simple, pointed, as in Mixodectes. 



This specimen had previously been referred to Mixodectes 

 but it differs in the retention of three incisor teeth and the 

 loss of the second premolar tooth, which is represented by an 

 alveolus in the type of Mixodectes pungens. There is little 

 question about the presence of three incisors, the median 

 one of which, although not preserved, has been much enlarged 



