Op 
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EOSTEIROMYS— —EOXERUS. 2 
Eosteiromys— Continued. 
Type: Eosteiromys homogenidens Ameghino, from the Eocene (Patagonian beds) 
of Patagonia. 
Extinct. 
Eosteiromys: n©s, dawn; -- Steiromys—i. e., an Eocene Steiromys. 
Eostylops Amecuino,1901. Tillodontia, Pantostylopide. 
Bol. Acad. Nac. Cien., Cordoba, X VI, 424, July, 1901 (sep. p. 78). 
Species: Hostylops diversidens Ameghino, and FE. obliquatus Ameghino, from the 
‘Cretaceous’ of Patagonia. 
Extinct. 
- Eostylops: AOs, dawn; 6rOAos, pillar; 6, aspect. 
Eosyndactylus AmEGHINO, 1890. Marsupialia, ? 
Bol. Inst. Geog. Argentino, XI, 185-186, July-Sept., 1890. 
Type not mentioned. Name provisionally proposed for a hypothetical genus 
supposed to have been the primitive ancestor of the polyprotodont marsupials. 
** Agregaré sólo, que no dudo de la existencia de los tipos teóricos Tritomodon, 
Eodiprotodon y Eosyndactylus, porque sin ellos no hay explicación del paren- 
teseo indudable que liga 4 todos los diprotodontes"' (1. c., pp. 189-190). 
Eosyndactylus: 7s, dawn; 69v, together; ócrvAos, finger. 
Eothenomys (subgenus of Microtus) MiuLER 1896. Glires, Murid:e, Microtinz. 
N. Am. Fauna, No. 12, pp. 9, 45-47, fig. 22, pl. 11, fig. 11, July 23, 1896. 
Type: Arvicola melanogaster Milne-Edwards, from Moupin and western Sechuen, 
Tibet. 
Eothenomys os, dawn, the East; -Gev, from; 0s, mouse—in allusion to its 
habitat in the far East. 
Eotherium Leipy, 1853. Ungulata, Perissodactyla, Titanotheriide. 
Proc. Acad. Nat. Sci. Phila. for 1852-53, No. X, 392, 1853; Journ. Acad. Nat. 
Sci. Phila., VII, 390, 1869. 
Type: Hotherium americanum Leidy, from the bad lands (Oligocene) of Nebraska. 
Extinct. Based on ‘‘numerous small fragments of bones and teeth, and also 
several entire superior molars." 
Eotherium: 7s, dawn; 65píov, wild beast—i. e., a primitive animal. 
Eotherium Owen, 1875. Sirenia, Halitheriid:e. 
Quart. Journ. Geol. Soc. London, XXXI, pt. 1, pp. 100-105, pl. m1, figs. 1-4, 
Feb. 1, 1875. 
Type: Éotheriwm xgyptiacum Owen, trom the Nummulitic Eocene of the Mokat- 
tam cliffs, south of Cairo, Egypt. 
Name preoccupied by Zotheriwm Leidy, 1853, a genus of Ungulata. Replaced 
by Eotheroides Palmer, 1899. 
Extinct. Based on ‘‘ part of the cranium, with a cast of its interior representing 
the brain." 
Eotherium: 7s, dawn; 07ptov, wild beast—i. e., an Eocene animal. 
Eotheroides Patmer, 1899. Sirenia, Halitheriide. 
Science, new ser., X, No. 249, p. 494, Oct. 6, 1899. 
New name for Hotherium Owen, 1875, which is precccupied by Kotherium Leidy, 
1853, a genus of Ungulata. 
Extinct. 
Eotheroides: Eotherium; £180c, form—i. e. resembling Eotherium. 
Eotomys (see Evotomys). Glires, Muridee, Microtin:e. 
Eoxerus (subgenus of Xerus) ForsytH-MaJsor, 1893. Glires, Sciuridee. 
Proc. Zool. Soc. London, June 1, 1893, 189, pl. vin, figs. 5-6, 11-12, 16-18; pl. 
IX, figs. 5-6, 11-12, 16-18; TnovEssaART, Cat. Mamm. Viv. et Foss., new ed., 
fasc. rr, 408-409, 1897; THomas, Proc. Zool. Soc. London, 1897, 933 (raised to 
generie rank and type fixed ). 
