226 INDEX GENERUM MAMMALIUM. 
Diastomicodon Awxzanuixo, 1884. Ungulata, Litopterna, Macraucheniide. 
Bol. Acad. Nac. Cien. Córdoba, VI, entr. 2-3, pp. 197-198, 1884; Act. Acad. Nae. 
Cien. Córdoba, VI, 546-547, 1889. 
Type: Diastomicodon lujanensis Ameghino, from the Arroyo de Fernandez, about 
a league from Villa de Lujan, province of Buenos Aires, Argentina. 
Extinct. Based on part of a lower jaw. - 
Diastomicodon: 61ai66@, to dart or shoot through the air, i. e., rapidly; rouzKos, 
cutting; 66@v=0ddovs, tooth. 
Dibelodon Corr, 1884. Ungulata, Proboscidea, Elephantide. 
Paleont. Bull., No. 39, p. 2, 1884; Proc. Am. Philos. Soc., XXII, pt. 1, for Oct. 21, 
1884, 2-8, Ds 1885. 
Type: Modo shepardi Leidy, from Contra Costa County, California. 
Extinct. Based on ‘a last inferior molar tooth.’ 
Dibelodon: 51-, two; BéAos, dart; 65@v=ddo0t's, tooth—in allusion to the pres- 
ence of upper incisors with enamel bands, in contrast with Mastodon, in which 
the bands are wanting. (Compare Tetrabelodon. ) 
Dicardia (subgenus of Kocardia) AMEGHINO, 1891. Glires, Eocardiid:e. 
Nuevos Restos Mamíf. Fós. Patagonia Austral, p. 16, Aug., 1891; Revista Argentina 
Hist. Nat., I) entr: ba, 902; Oct. 15.1891 Enum. Syn. Marne Foss. Patagonie, 
74, fig. 29, Feb., 1894 (raised to generic rank). 
Species, 3: Dicardia maxima Ameghino, D. modica Ameghino, and D. excavata 
Ameghino, all from the Lower Eocene of southern Patagonia. 
Extinct. 
Dicardia: 61-, two; Kapdia, heart—in allusion to the fourth lower premolar, 
which consists of two triangular prisms. 
Diceratherium Marsn, 1875. Ungulata, Perissodactyla, Rhinocerotide. 
Am. Journ. Sci. & Arts, 3d ser., IX, 242-244, Mar., 1875; Hay, Cat. Foss. Vert. 
N. Am., Bull. 179, U. S. Geol. Surv., 644, 1902 (type fixed). 
Species, 3: Diceratherium «rmatum Marsh (type), and D. nanum Marsh, from the 
Miocene beds near the John Day River, Oregon; and D. advenum Marsh, from 
the Upper Eocene (?) of Utah. 
Extinct. 
Mceratherium: 61-, two; Képas, horn; Gypiov, wild beast—in allusion to the 
transversely paired nasal horns. 
Dicerorhinus GrocEn, 1841. Ungulata, Perissodactyla, Rhinocerotid:e. 
Hand- u. Hilfsbuch Naturgesch., I, pp. xxxii, 125, 1841; THomas, Ann. & Mag. 
Nat. Hist., 6th ser., X V, 191, 192, Feb. 1, 1895. 
Type: Rhinocerde Ruhanenst Cuvier, from Sumatra. 
Name antedated by Didermocerus Brookes, 1828 
Dicerorhinus: 01-, two; Képas, horn; Ais; pivósc, nose—from the two nasal horns. 
Diceros Gray, 1821. Ungulata, Perissodactyla, Rhinocerotide. 
London Med. Repos., XV, 306, Apr. 1, 1821; THomas, Ann. & Mag. Nat. Hist., 
4th ser., XV, 192 footnote, Feb., 1895. 
Type: Rhinoceros bicornis Linnzeus, from Africa. 
Name preoccupied by Diceras Lamarck, 1805, a genus of Mollusca (fide Thomas). 
(See Opsiceros Gloger, 1841.) 
Diceros: 01-, two; Képas, horn—from the two nasal horns. 
Dichobune (subg. of Anoplotherium) Cuvier, 1822. Ungulata, Anoplotheriide. 
Recherches Ossem. Foss., nouv. éd., III, 64, 70*—71, pls. vri figs. 83-4, 6-7, 1x fig. 1, 
XII fig. 4, xLir fig. 5, Lvr fig. 8, 1822; DrsmMarest, Mammalogie, II, Suppl., 
545, 1822. 
Dolichotuna Gray, Thomson’s Ann. Philos., XXVI, 343, Nov., 1825 (misprint). 
Dichobunus OwkEs, Trans. Geol. Soc. Lond., 2d ser., VI, 45, 1841 (fide LybEKKER, 
Cat. Foss. Mamm. Brit. Mus., IT, 165, 1885); LvpEKKER, in Nicholson & 
Lydekker's Man. Paleont., IT, 1331, 1889. . 
Dichobunes Puriuies & Dom En:yc. Metropolitana, VI, 687, 1845. 
