THOATHERIUM —THORACOTHERION. 615 
Thoatherium AMEGHINO, 1887. Ungulata, Litopterna, Proterotheriide. 
Enum. Sist. Especies Mamíf. Fós. Patagonia Austral, pp. 19-20, Dec., 1887. 
Type: Thoatherium minusculum Ameghino, from the Tertiary of southern 
Patagonia. 
Extinct. 
Thoatherium: 0062, active, swift; 07pior, wild beast. 
Thomashuxleya AwranuiNo, 1901. Ungulata, Ancylopoda, Homalodontotheriidz. 
Bol. Acad. Nac. Cien. Córdoba, XVI, 409-410, July, 1901 (sep. pp. 63-64). 
Type: Thomashuxleya rostrata Ameghino (= Asmodeus scotti Ameghino, 1897, not 
A. scotti Ameghino, 1895), from the ‘Cretaceous’ of Patagonia. 
Extinct. 
Thomashuxleya: In honor of Thomas Henry Huxley, 1825-95; author of ‘The 
Theory of the Vertebrate Skull,’ 1859; ‘Evidence of Man’s Place in Nature,’ 
1863; ‘Manual of the Anatomy of Vertebrated Animals,’ 1871; and many 
special papers on anatomy and zoology. 
Thomasomys (subg. of Hesperomys) Cours, 1884. Glires, Murid:e, Cricetine. 
Am. Naturalist, XVIII, for Dec., 1884, p. 1275, Nov. 19, 1884; * THomas, Ann. 
& Mag. Nat. Hist., 7th ser., I, 453, June, 1898 (raised to generic rank). 
Type: Hesperomiqs cinereus Thomas, from Cutervo, Province of Chota, northern 
Peru (alt. 9,200 ft. ). 
Thomasomys: Thomas; 0s, mouse—in honor of Oldfield Thomas, 1858—, 
curator of mammals in the Natural History Museum, London; author of 
‘Catalogue of the Marsupialia and Monotremata in the British Museum,’ 1888, 
and numerous papers on mammals. 
Thomomys Maximi.ian, 1839. Glires, Geomyid:e. 
Nova Acta Acad. Cees. Leop.-Carol., XIX, pt. 1, 377-384, 1839; ALLEN, Bull. Am. 
Mus. Nat. Hist., N. Y., V, 62, 1893 (locality of type); Mrrrram, N. Am. Fauna, 
No. 8, pp. 198-199, figs. 68-71, Jan. 31, 1895. 
Tomomys BRANDT, Mém. Acad. Imp. Sci. St.-Pétersbourg, 6° sér., Sci. Nat., VII, 
188-191, 1855. 
Type: ener: rufescens Maximilian, from the Missouri River; exact locality 
unknown. 
Thomomys: 6c40s, heap; “0s, mouse—in allusion to the heaps of earth thrown 
out at frequent intervals along the line of the burrows. 
Thoopterus (subg. of Cynopterus) Marscuin, 1899. Chiroptera, Pteropodidee. 
Fledermáuse Berliner Mus. Naturkunde, Lief. i, Megachiroptera, 73, 77, 1899. 
Type: Cynopterus nigrescens (Gray), from Morty Island, Malay Archipelago. 
Thoopterus: 90s, wolf; mrepoets, winged—i. e., a flying wolf or fox. 
Thoracophorus H. Gervais & AMEGHINO, 1880. Edentata, Glyptodontidze. 
Les Mammiféres foss. Amérique du Sud, 206-211, 1880. 
Type: Glyptodon elevatus Nodot, from the Pleistocene of Argentina. 
Name preoccupied by Thoracophorus Hope, 1840, a genus of Coleoptera. Replaced 
by Neothoracophorus Ameghino, 1889. (See Myloglyptodon Ameghino, 1884.) 
Extinct. Based on a large fragment ot the carapace. 
Thoracophorus: 0cpa&, breastplate; opósc, bearing—in allusion to the carapace 
Thoracotherion Gray, 1869. Ungulata, ? 
Cat. Carn., Pachyderm., & Edentate Mamm. Brit. Mus., 262, 1869 (nomen nudum ). 
"A large number of fossil genera belong to this suborder [Nasuta], : 
Lophiodon, Thoracotherion, Anthracotherion, Coryphodon; but many of these 
are only known from a few bones or teeth." (Gray. ) 
Extinct. 
Thoracotherion: 0pa&, 6cpaios, breastplate; Oypiorv, wild beast. 

* For exact date of publication, see Am, Naturalist, XIX, 57, Jan., 1885. 
