160 GIBBTJS. 



G-ASTEOPLAX. Blainville. Umbeella, Lam. De Blainville 



' described tliis genus from a specimen in which the shell had been, 



probably by accident, placed upon the under part of the animal, 



and not discovering his error untd. afterwards, gave it the above 



name. 



GEN A. G-ray. Part of Stomatella, Lamarck. 



GEOMITEA. Swainson. A sub-genus of Geotrochus, Sw. 

 founded on a trochiform species of Helix, with coronated 

 nodules on the whorls. Helix bicarinata, Sow. Zool. Journ. 1, 

 pi. iii. fig. 7. Sw. page 166 and 332. 



GEOPHONUS, Montf Conch. Syst. t. 1, p. 19. A genus of 

 microscopic Eoraminifera. 



GEOTEOCHUS. Swainson, (1824.) Helix pdeus, Auct. (fig. 



, 278,) and other trochiform species. Divided into the sub-genera 

 Pithohelix, Geotrochus, Hemitrochus, Gonidomus,and Geomitra. 

 Sw. p. 165 and 166, described at page 331. PI. xiii. fig. 278. 



GEOVIJLA. Swainson. A sub-genus of Melampus (Auricula), 

 consisting of oval species, resembling Auricxda Midse, fig. 297. 



GEEVILLIA, Defp. Fam. Margaritacea, Bl. Malleacea, Lam. 

 — Descr, Equivalve, oblong, oblique ; hinge long, straight, 

 having small, irregular, transverse ligamentary pits. — Ohs. This 

 genus of fossd. shells, found at various geological periods, from 



■ the Lias to the Baculite limestone in Normandy, is now extinct. 

 In general form it resembles Avicula, but in the hinge it ap- 

 proaches Perna. G. Avicularis. PI. x. fig. 169. 



GIBEEULA. Sw. A genus separated from Maegineila, Auct. 

 and thus described, " sub-oval ; spire slightly prominent ; top 



• of the outer lip dilated and gibbous ; base of the inner lip 



. with plaits ; inner lip broad, spreading, G. Zonata. Enc. Meth. 

 374, f. 6." 



GIBBOSE or GIBBOUS. (Gibbosus.) Bunched out, embossed, 



. having a lump or swelling of any kind. Ex. Bulinus Lyone- 

 tianus, (fig. 284) named Gibbus by De Montfort. Ovulum 

 gibbosum. 



GIBBUS. Montfort, (1810.) Bulinus Lyonetianus, Lam. 

 Pupa, Bl. PI. xiv. fig. 284. 



