OROHIPPUS—ORTHOCYNODON. 481 
Orohippus Marsn, 1872. Ungulata, Perissodactyla, Equide. 
Am. Journ. Sci. & Arts, 3d ser., IV, 207, Sept., 1872 (sep. issued Aug. 7). 
Type: Orohippus pumilus Marsh, from the Eocene of Grizzly Buttes, near Fort 
Bridger, Wyoming. 
Extinct. Based on ‘two separate series of upper molar teeth, four of each.’ 
Orohippus: Opos, mountain; 7z70s, horse. 
Oromeryx Marsn, 1894. Ungulata, Artiodactyla, Agriocheerid:e. 
[Proc. Am. Ass. Adv. Sci., XX VI, 242 (sep.), Aug., 1877 nomen nudum. ] 
Am. Journ. Sci., 3d ser. [XIV, No. 83, pp. 364, 365, Nov. 1877 nomen nudum]; 
XLVIII, No. 285, pp. 269-270, fig. 23, Sept., 1894. 
Type: Oromeryx plicatus Marsh (1894), from the Eocene of the Uinta Basin, 
northeastern Utah. 
Extinct. 
Name preoccupied by Oreomeryx Mercerat, 1891, a genus of Litopterna. 
Oromeryx: Opos, Opéos, mountain; 47)?pv&, ruminant. 
Oromys Leripy, 1853. Glires, Caviidee. 
Proc. Acad. Nat. Sci. Phila., 1852-53, 241. 
Type: Oromys xsopi Leidy, from the Pleistocene of Ashley River, South Carolina. 
Extinct. Based on ‘a fragment of an incisor.’ 
Oromys: Opos, mountain; “0s, mouse. 
Orophodon Amecuino, 1895. Edentata, Orophodontid:e. 
Bol. Inst. Geog. Argentino, XV, cuad. 11-12, p. 658, 1895 (sep. p. 58). 
Type: Orophodon hapaloides Ameghino, from the Pyrotherium beds in the inte- 
rior of Patagonia. 
Extinct. Based on isolated teeth. 
Orophodon: ópoQn), root; 65@v=ddo0v's, tooth. 
Orotherium Avwanp, 1850. Ungulata, Artiodactyla, Cervidee? 
Ann. Soc. Agr., Sci, Arts et Comm. du Puy, XIV, 81, 82 footnote, 1850; 
Gervais, Zool. et. Paléont. Francaises, 2° éd., 143 footnote, 1859. 
Type: Orotherium ligeris [liguris?] Aymard, from the Miocene of Ronzon, near 
Puy en Velay, France. 
Extinct. Based on fragments of horns and portions of a lower jaw containing 
six first molars. 
Orotherium: Opos, mountain; 607píov, wild beast. 
Orotherium Mansu, 1872. Ungulata, Perissodactyla, Equid:e. 
Am. Journ. Sci. & Arts, 3d ser., IV, 217, Sept., 1872 (sep. issued Aug. 13). 
Type: Orotherium uintanum Marsh, from the Eocene of Henry Fork of Green 
River, Wyoming. 
Extinct. Based on 'a nearly entire lower jaw, with the last six teeth in perfect 
preservation.’ 
Name preoccupied by Orotherium Aymard, 1850, a genus of Cervidz (?). 
Orthaspitherium LEworxE, 1885. Ungulata, Condylarthra, Pleuraspidotheriid:e 
Bull. Soc. Géol. de France, 3* sér., XIII, No. 3, p. 205, pl. xu, fig. 47, Apr., 1885, 
Orthaspidotherium LEMoINE, ibid., XIX, No. 5, pp. 284-285, pl. xr, figs. 95-108, 
May, 1891. 
Type: Orthaspidotherium edwardsii Lemoine, from the Lower Eocene near Reims, 
France. 
Extinct. Based on teeth. 
Orthaspidotherium: Ópfós, straight; dózíc, @oxidos, shield; 0ppíov, wild beast— 
in allusion to **l'allongement et la direction perpendiculaire de ses denticules." 
Orthocynodon Scorr & OsBorn, 1882. Ungulata, Perissodactyla, Amynodontide. 
Am. Journ. Sci. & Arts, 3d ser., XXIV, No. 141, pp. 223-225, Sept., 1882. 
Type: Orthocynodon antiquus Scott & Osborn, from the Eocene (Bridger) of Bitter 
Creek, Wyoming. 
Extinct. Based on ‘the skull and lower jaw of one individual, and a portion of 
the skull containing the molar series of another.’ 
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