134 INDEX GENERUM MAMMALIUM. 
Bathmo4don Corr, 1872. Ungulata, Amblypoda, Coryphodontid:e. 
Proc. Am. Philos. Soc., XII (read Feb. 16), 417-420, Jan.—June, 1872; Proc. 
Acad. Nat. Sci. Phila., June 25, 1872, 38; Hay, Cat. Foss. Vert. N. Am., Bull. 
179, U. S. Geol. Surv., 697, 1902 (type fixed). 
Species: Bathmodon radians Cope (type), and JB. semicinctus Cope, from the 
Wasatch beds near Evanston, Wyoming. 
Extinct. 
Bathmnodon: Bafiuós, step; 0d5@v =06 00s, tooth—tfrom “ the dental series [which] 
increases regularly in size, from before backwards, the last being a little larger 
than the penultimate" (Cope). 
Bathrodon Mansnu, 1872. Glires, Proglires, Mixodectidee. 
Am. Journ. Sci. & Arts, 3d ser., IV, 211-212, Sept., 1872 (sep. issued Aug. 13); ° 
OsBoRN, Bull. Am. Mus. Nat. Hist., N. Y., XVI, 212-213, fig. 40, June 28, 
1902 (ordinal position); Hav, Cat. Foss. Vert. N. Am., Bull. 179, U. S. Geol. 
Surv., 793, 1902 (type fixed). 
Species: bathrodon typus Marsh (type), from the Eocene of Grizzly Buttes, near 
Fort Bridger; and 5. annectens Marsh, from the Eocene of Henry Fork of Green 
River, Wyoming. 
Extinct. 
Bathrodon: fiáüpov, step; 06v —080)6, tooth—in allusion to the difference in 
height of the cusps of the molars. 
Bathyergus ILiicrr, 1811. Glires, bathyergid:e. 
Prodromus Syst. Mamm. et Avium, 86, 1811. 
Type: Mus maritimus Gmelin, from the Cape of Good Hope. 
Bathyergus: Badvepy éco, to work deep, to plow deep—from the burrowing habits 
of the animal. 
Bathygenys Dovarass, 1901. Ungulata, Artiodactyla, Agriochoridze. 
Trans. Am. Philos. Soc., new ser., X X, pt. 111, 256-259, pl. rx, figs. 7-8, Dec. 5, 
1901 (sep. pp. 20-23). 
Type: Bathygenys alpha Douglass, from the White River Oligocene (Pipestone 
beds), near Whitehall, Jefferson County, Montana. 
Extinct. Based on the anterior part of a left mandibular ramus. 
Bathygenys: Pabtvs, deep; yévvs, the lower jaw—from the depth of the jaw. 
Bathyopsis Corr, 1881. Ungulata, Amblypoda, Uintatheriide. 
Am. Naturalist, XV, 75, Jan., 1881; XIX, No. 6, 594, June, 1885; Bull. U. S. 
Geol. & Geog. Surv. Terr., VI, No. 1, 194-196, Feb. 11, 1881. 
Type: Bathyopsis fissidens Cope, from the Eocene beds of Wind River Basin, 
Wyoming. 
Extinct. Based on a mandible. 
Bathyopsis: Babts, deep; ors, appearance, form—from the great vertical depth 
of the mandibular ramus. 
^ 
Batodon Marsn, 1892. Marsupialia, Cimolestidze. 
Am. Journ. Sci. & Arts, 3d ser., XLIII, 258, pl. x fig. 6, pl. x1 figs. 2, 5, Mar., 
1892. 
Type: Batodon tenuis Marsh, from the Cretaceous (Laramie) of Wyoming. 
2xtinet. *''Represented by several specimens." 
Batodon: Paros, bramble; 08v = ddo0vs, tooth. 
Batomys THomas, 1895. Glires, Muridee, Murinee. 
Ann. & Mag. Nat. Hist., 6th ser., XVI, 162-163, Aug., 1895; Trans. Zool. Soc. 
London, XIV, pt. vr, 405-406, pls. xxxm fig. 2, xxxvi figs. 5, 8, June, 1898. 
Type: Datomis grantii Thomas, from Monte Data, northern Luzon, Philippine 
Islands. 
Batomys: f5&ros, bush, bramble; 0s, mouse—*bush mouse,’ in allusion to its 
habitat. 
