MIOHIPPUS. 



55 



width; (4) premolars 2-4 exceeding molars 1-3 in length; (5) molars bunoselenodont in character, lophs interrupted, 

 protocone large; (6) hypostyle separate and distinct or only slightly connected with posterior cingulum, in some speci- 

 mens (e. <j. American Museum 1043) still partly connected. Despite the foregoing progressive characters, (7) protoloph 

 decidedly interrupted by protoconule; (S) molars more brachyodont than in M. meteulophus; (9) parastyle broad and 

 rounded when worn, as in M. brachystylus and il/. bairdii. (10) A characteristic feature of this species is the long and 

 rather slender metapodials combined with short phalanges; leads up into Kalohafi ppus. 



To this species is also referred a palate, Amer. Mus. 1043, which exhibits the same characters. 



Fig. 32. Miohippus intermedins Osborn and Wortman, Am. Mus. 1196. (Upper) Original figure of skull of type. 

 One-half natural size. (Lower) Original figure of left upper molars of type. Natural size. After Osborn, 1904, skull 

 PI. v, F, teeth fig. 7, p. 176. 



Miohippus validus Osborn, 1904. 



Plates. 1.4, 3.5. Text Fig. 33. 



Mesohippus validus, sp. nov., Osborn, Henry F. "New Oligocene Horses," Bull. Amer. Mus. Nat. Hist., Vol. XX, Art. XIII, May 

 28, 1904, p. 177, PI. v, H. 



Horizon and LoeaJifi/.— Big Badlands, Cheyenne River, South Dakota, Protoceras zone. Type collected by Ameri- 

 can Museum Expedition, 1894. 



Type.— Amer. Mus. 1218, skull and jaws and portions of limbs. Measurements: p'-m 3 .104; m 1-3 .047; in 1 a. p. 

 .0165, tr. .021; basilar length, condyles to premaxillary symphysis. .250+. 



To this type is also referred the adult skull Amer. Mus. 6S0 with well worn teeth; also the skull Princeton Mus. 10733. 



Type figure.— Text Fig. 33 of this Memoir. 



