406 INDEX GENERUM MAMMALIUM. 
Megamys D'OnniGNv & LAuRILLARD, 1842. Glires, Chinchillidze. 
D'OnnioNv & LavRr,LARD, in D'Orbigny's Voy. Amérique Mérid., III, 4° pt., 
Paléont., 110-112, ‘pl. xir, figs. 4-8,’ 1842 (provisional name). 
Megalomys 'TRovEssART, Ann. & Mag. Nat. Hist., 7th ser., XI, 587, Apr., 1903 
(emendation ). 
Type: Megamys patagonensis D'Orbigny & Laurillard, from Ensenada de Ros, 
south of the Rio Negro, Patagonia. : 
Extinct. Based on a tibia and patella. 
Megamys: £y as, great, large; “40s, mouse—said to have been nearly as large as 
an ox. 
Meganeuron (subgenus of Catodon) GRAY, 1865. Cete, Physeterid:e. 
Proc. Zool. Soc. London, 1865, 439-442, figs. 1—4 in text; Cat. Seals & Whales 
3rit. Mus., 387-389, 1866 (raised to generic rank). 
Type: Catodon ( Meganeuron) krefftii Gray, from Australia. 
Meganeuron: uéy ac, uéy a, great, large; vedporv, nerve—in allusion to the size 
of the central canal of the atlas. 
Megantereon Croizer & Jopert, 1828. Fere, Felide. 
Recherches Ossem. Foss. Dépt. Puy-de-Dóme, 200-201, pl. 1, fig., 1828 (chats 
foss.); Ann. Sci. Nat., X VII, 150, 1829. 
Meganthereon PowEL, Cat. Méth. Vert. Foss. Bassin de la Loire, 54-57, 1854; 
ZrrrEL, Handb. Palaeont., IV, 3te Lief., 673, 1893 (under Machairodus). 
Type: Felis megantereon Croizet & Jobert, Son Mt. Perrier, Puy-de-Dóme, France. 
Name provisionally proposed. ‘‘Nous lui donnerons le nom de felis megantereon, 
Si quelques naturalistes pensaient qu'on doit le regarder comme le type 
d'un genre nouveau, on pourrait nommer simplement cet animal megantereon, 
mot qui deviendrait le nom du genre." 
Extinct. Based on part of a jaw. 
Megantereon: uéy as, uéy a, great; avGepew@r, chin. 
Megaptera Gray, 1846. Cete, Baleenidee. 
Zool. Voy. H. M. 8. ‘ Erebus & Terror,’ I, Mamm., 16-18, tab. 33, figs. 1, 2, 1846; 
Frowzn, Proc. Zool. Soc. London, 1864, 395 (type fixed). 
Megapteron WAGNER, Wiegmann's Archiv Naturgesch., 1847, Bd. 1, 38. 
Species, 6: Balena nodosa Bonnaterre, Balenoptera poeskop Desmoulins, Balena 
longimana Rudolphi (type), Megaptera americana Gray, Balxnoptera antarctica 
Temminck, and Bal:noptera boops? Pallas. 
Megaptera: uéy ec, u£y a, great, large; zr&póv, wing, fin—in allusion to the unu- 
sually long pectoral fins, which are more than one-fourth the length of the body. 
Megapteropsis Van BENEDEN, 1872. Cete, Balzenidee. 
Bull. Acad. Roy. Sci. de Belgique, 2° sér., XX XIV, 15, 1872 
Type: Megapteropsis robusta, Van Beneden from Wyneghem, Antwerp, Belgium. 
Extinct. Based on ‘un maxillaire assez complet.’ 
Megapteropsis: Megaptera; wis, appearance. ‘‘Nous avons donné ce nom à un 
animal qui a des affinités étroites avec les Megaptera d'aujourd'hui." 
Megastus Rorn, 1898. Glires, Caviidee. 
Revista Mus. La Plata, IX, 193-194, 1898 (sep. pp. 53-54). 
Type: Megastus elongatus Roth, from the ‘toba terciaria’ of the Rio Collon-Curá, 
"Territory of Neuquen, Argentina. 
Name preoccupied by Megastes Guénée, 1854; and by Megastes Boisduval, 1870— 
both genera of Lepidoptera. Replaced by Magestus Ameghino, 1899. 
Extinct. Based on a nearly perfect skull. 
Megastus: u£y «s, great. 
Megatherium G. Cuvier, 1796. Edentata, Megatheriidze. 
Mag. Encyclop., III, Ann. IV, 303, 308-310, pls. 1, 1r, fig. 3, 1796; Tabl. Élém. 
Hist. Nat., 146, 1798; Lecons Anat. Comp., I, table r, 1800. 
