294 INDEX GENERUM MAMMALIUM. 
Geosciurus A. SurrH, 1834. Glires, Sciuridee. 
S. Afr. Quart. Journ., II, No. 2, p. 128, Jan.-Mar., 1834 (provisional name); 
Gray,-Ann. & Mag. Nat. Hist., 3d ser, XX, 332, 333-334, Nov., 1867; 
TRovEssART, Cat. Mamm. in Bull. Soc. Y" Études Sci. d'Angers, X, 1° fasc., 85, 
1880; THomas, Proc. Zool. Soc. London, 1897, 933 (type given as X. capensis). 
Type: Sciurus erythopus Geoffroy, from West Africa. 
Geosciurus: Y 9), earth; + Sciurus—'ground squirrel,’ from its terrestrial habits. 
Geotrypus Pome, 1848. Insectivora, Talpid:e. 
Archiv Sci. Phys. et Nat., Bibl. Univ. Genéve, IX, 159-160, 246, Oct., 1848; 
Cat. Méth. Vert. Foss. Bassin de la Loire, 11-12, 1854. 
Species: Geotrypus acutidens Pomel, from the Tertiary of Cournon, near Issoire; 
and G. antiquus (= Talpa antiqua Blainville), from Puy-de-Dóme, France. 
Extinct. 
Geotrypus: yh, earth; rovz&co, to bore—in allusion to its supposed fossorial 
habits. 
Gephyranodus AwEGniNo, 1891. Edentata, '" 
Revista Argentina Hist. Nat., I, entr. 2a, 119-120, Apr. 1, 1891. 
Type (species not mentioned), from southern Patagonia (near Gallegos?). The 
description is quoted from a letter from Carlos Ameghino, and the name 
appears only in a footnote without initials of the author. 
Extinct. Based on ‘‘un cráneo bastante completo." 
Gephyranodus:, y épvpa, bridge; av-, without; óóovs, tooth. 
Gerbilliscus (subgenus of Gerbillus) THomas, 1897.  Glires, Murid:e, Gerbillin:e. 
Proc. Zool. Soc. London, 1897, pt. 1, 433, Oct. 1, 1897; Ann. & Mag. Nat. 
Hist., 7th ser., IX, 441-442, June, 1902 (raised to generic rank). 
Type: Gerbillus bóhmi Noack, from Qua Mpala, on Lake Tanganyika, Marungu, 
East Africa. 
Gerbilliscus: Dim. of Gerbillus. 
Gerbillus Desmarest, 1804. Glires, Murid:e, Gerbilline. 
Nouv. Dict. Hist. Nat., XXIV, Tab. Méth. Mamm., 22, 1804; W. L. SCLATER, 
Ann. S. Afr. Mus., I, pt. 2, pp. 190-193, Mar., 1899 (type fixed). 
Species, 3: Gerbillus xgyptius Desmarest (=Mus longipes Linnzus, type), from 
Egypt; G. canadensis Desmarest, from Canada; and G. pyramidum Desmarest, 
from Egypt. 
Gerbillus: Dim. of gerbua or jerboa, from Arabic yarbi, the flesh of the back and 
loins, an oblique descending muscle. Applied to the jerboa in allusion to the 
strong muscles or its hind legs. (CENTURY Dicr. ) 
Gerboides (‘I. Grorrroy’) GEnvaArs, 1855. Marsupialia, Macropodid:e. 
GxorrFROy, in Gervais’ Hist. Nat. Mamm., II, 271, 1855. 
Type: Kangurus rufus Desmarest, from Australia. 
Gerboides: Gerbua or jerboa; £180s, form. 
Gerbua F. Cuvier, 1825. Glires, Pedetidee. 
Dents Mamm., 254, 1825 (synonym of Helamys). 
Type: Gerbua capensis Cuvier ( — Mus caffer Pallas), from the Cape of Good Hope. 
Probably a modification of Yerbua Forster, 1778. 
Gerbua: a form of jerboa. 
Gergoviomys (Croizer MS.) BrarNviLLE, 1840. Glires, Theridomyide. 
L'Institut, VIII, 207, 1840; Comptes Rendus, Paris, X, No. 24, p. 931, Jan.—June, 
1840 (nomen nodum?). 
Type: Gergoviomys sp. Name of a genus of fossils from Auvergne, France, in 
Croizet’s manuscript catalogue, quoted by Blainville. 
Extinct. 
Gergoviomys: Gergovia, a mountain near Ménat, Puy-de-Dóme, France; “0s, 
mouse. 
