190 



UNGULATA 

 shortened 



ORDER VII 



Size that of a wild sheep. John 



Orbits nearly closed. Face 

 Day and Protoceras beds, 



Oxydadylus Peterson. Orbits closed. Lateral vestiges fused to metapodials. 

 Miocene (Upper Harrison beds) ; Nebraska. 



Subfamily 3. Protolabinae Cope. 



Cheek, teeth hypsodont. Orbit completely swrronnded by bone. Radius and 

 ulna coalesced. Feet with two digits ; lateral metapodials vestigial, fused, principal 

 metapodials usually fused into a cannon bone. Between the llama and camel in 

 size: Miocene and Pliocene ; North America. 



Protolabis Cope. Dental formula : 



3.1.4.3. 



First premolar sometimes 



3.1.4.3. 



absent. Metapodials not wholly anchylosed. Upper Miocene (Loup Fork 

 beds) ; North America. P. angustidens, heterodontus Cope, longiceps Matthew.* 



Procamelus Cope 



262). Dental 

 LI. 4.3. 



Procamelus occidentalis Loidy. Lower Pliocenfi, New Mexico. Skull. 

 1/4- (After Cope.) 



(Fig 



^"'^^^^^"^ 3.1.4.3. 

 Metapodials fused 

 Loup Fork beds. P 

 occidentalis, robustus. 

 gracilis Leidy. 



Pliauchenia Cope 

 Without second pre 

 molar. Upper Miocene 

 P. spatida Cope, gigas 



(Loup Fork beds) and Pliocene ; North America 

 Matthew and Cook, vera Matthew. 



Alticainelns Matthew. Without first and second superior incisors, but 

 with four premolars in both jaws. Neck, metapodials, femur and tibia very 

 long. Loup Fork beds ; Colorado. Pliocene ; Nebraska. 



Subfamily 4. Stenomylinae Matthew. ^ 



Incisors and canine forming a continuous closed series. Premolars nmch reduced; 

 lower canine and first premolar caniniform. Molars long, narrow and hypsodont. Orbit 

 large, placed well back and closed pjosteriorly. Vomer, pterygoid processes of palatines, 

 presphenoid consolidated, forming a heavy convex ridge, interrupting the backward 

 passage of the posterior nares. Coronoid process small and displaced excessively 

 backward. Pes -with two digits, the lateral metapiodials consisting of sesamoid-like 

 vestiges. Terminal phalanges small, hoof -like. Lower Miocene ; North America. 



Stenomylus Peterson. Dental formula 



Premolars much reduced. 



3.L4^ 



3.l74T3^' 



Large neck, long and slender limbs, size that of a sheep. Lower Miocene ; 

 western Nebraska. S. gracilis Peterson. 



' Peterson, 0. A., Aun. Carnegie Mus., vol. iv., 1906-8, pp. 41, 286-300 ; vol. vii., 1911, pp. 

 267 -27Z.—Matt/iCic, W. I)., Bull. Amer. Museum of Nat. Hist., vol. xxvii., 1910, p. ^2.—Loumis, 

 F. B., Amer. Jour. Sci., vol. xxix., 1910, pp. 297-323. 



