9326 INDEX GENERUM MAMMALIUM. 
Hippidion Owen, 1869. Ungulata, Perissodactyla, Equidze. 
Proc. Roy. Soc. London, X VII, No. 109, p. 268, for Feb., 1869; Philos. Trans. Roy. 
Soe. London for 1869, 159, 5E u, 572-573, pl. rnxrr, figs. 1-10, 14, 16, 1870; 
Hay, Cat. Foss. Vert. N. Am., Bull. 179, U. S. Geol. Surv., 618, 1902 (type). 
Hippidium Burmeister, Los Caballos Fós. de la Pampa Argentina, 5-68, pls. 
1-virr, 1875; Supl., 3-13, pl. xr, figs. 3-6, 1889. 
Species, 3: Equus neogeus Lund (type), and E. principalis Lund, from Brazil; and 
E. arcidens Owen, from the Arroyo Negro, near Paysandu, Uruguay. 
Extinct. 
Hippidion: ixzos, horse; 76105 (neuter 7010r *), peculiar. 
Hippocamelus Levuckart, 1816. Ungulata, Artiodactyla, Cervide. 
Dissertatiuncula Inaug. de Equo bisulco Moline, 24, 1816; Gray, Cat. Mamm. 
Jit. Mus., pt. m1, Ungulata, 226, 227, 1852 (under Furcifer); Tuomas, Proc. 
Zool. Soe., London, 1898, 212. 
Type: Hippocemelus dubius Leuc kart (—JZqwus bisulcus Molina), from the Cor- 
dillera of Chile. 
Hippocamelus: tzz0s$, horse; Kaundos, camel—from the supposition that the 
animal was intermediate between a horse and a llama. 
Hippodactylus Corr, 1888. Ungulata, Perissodactyla, Equidze. 
Am. Naturalist, X XII, 449, May, 1888. 
Type: Hippotherium antelopinum Falconer & Cautley, from the Siwalik Hills of 
India. 
Extinct. 
Hippodactylus: tx7o0s, horse; ócrvAos, toe—in allusion to the single metapodials. 
Hippodon Leripy, 1854. Ungulata, Perissodactyla, Equidee. 
Proc. Acad. Nat. Sci. Phila., 1854, 90. 
Type: Hippodon speciosus Leidy, from the Upper Miocene of the Bijou Hills, east 
of the Missouri River, South Dakota. 
Extinct. Based on an inferior molar. 
Hippodon: tzz06s, horse; 65@v=0do0vs, tooth—in allusion to the type specimen, 
‘Can inferior molar of a solipedal animal apparently intermediate to Hquus and 
Anchitherium." | (LEg1pv.) 
Hippohyus FarcoxEkR & Cautiey,t 1845. Ungulata, Artiodactyla, Suidee. 
[Fatconer & CavrLEY, in] Owen’s Odontography, pt. 111, 562-565, Descr. Plates, 
35, pl. 140, fig. 7, 1845; Lydekker, Cat. Foss. Mamm. Brit. Mus., rr, 259, 1885. 
Type: Hippohyus sivalensis Falconer & Cautley, from the Pliocene of the Siwalik 
Hills, India. . 
Extinct. 
Hippohyus: ixzos, horse; Us, &6s, hog. 
Hippopotamodon LyprEKKER, 1877. Ungulata, Artiodactyla, Hippopotamide. 
Records Geol. Surv. India, X, pt. 2, p. 81, May, 1877. 
Type: Hippopotamodon sivalense Lydekker, from the Pliocene of the Siwalik 
Hills, in the vicinity of the village of Asnot, Punjab, India. 
Extinct. Based on part of the left maxilla, including three imperfect teeth. 
Hippopotamodon: Hippopotamus; 66@v=660vs, tooth. 
Hippopotamus Linnaus, 1758. Ungulata, Artiodactyla, Hippopotamidee. 
Systema Natura, 10th ed., I, 74, 1758; 12th ed., I, 101-102, 1766; Brisson, Reg- 
num Animale in Classes ie distrib., 2d ed. 12, 83-84, 1762; W. L. SCLATER, 
Mamm. &. Africa, I, 267-272, figs. 67-78, 1900 (type fixed). 
* The neuter form was probably adopted to agree with Horn ion m Hippotherium. 
+ Hippohyus is credited to Falconer & Cautley by Lydekker (Cat. Foss. Mamm. 
Brit. Mus., pt. 11, 259, 1885), but their names do not appear in the description of the 
genus in Owen’s Odontography. 
