HALIOTIS. 163 



GEATELOIJPIA. Desmoulins, 1828. i^am. Nyniphacea,Lam.— 

 Descr. Equivalve, inequilateral, sub-cuneiform, rounded ante- 

 riorly, sub-rostrated posteriorly ; biage witb tbree cardinal teetb, 

 a series of five or six irregular, small, diverging teetb bebind 

 tbe umbones, and one lateral anterior tootb in eacb valve ; 

 ligament external ; muscular impressions two ; paUeal impression 

 sinuated posteriorly. — Obs. Tbis genus (Donax irregularis, Bast.) 

 is only known in a fossil state. PL v. fig. 102. Gr. Moulinsii. 



GETPH^A. Lamarck, 1801. (Prom Gryps, a griffin.) Fam. 

 Ostracea, Lam.— -Descr. Inequivalve, free ; lower valve large, 

 concave ; witb tbe umbo prominent, incurved : upper valve 

 small, flat, opercular ; binge tootbless, witb a curved, depressed 

 area; one muscular impression. — Obs. Tbese sbells, wbicb 

 approacb tbe Oysters, are of a more regular form, and are re- 

 markable for tbe curved, produced beak of tbe lower valve. 

 Tbey are only known in a fossil state, belonging to tbe more 

 ancient strata. Fig. 182, G. incurva. Tbe recent species men- 

 tioned by Lamarck is not a true Grypbaea. PL x. fig. 182. 



GYMNOLEPAS. A generic name used by De Blainville to 

 include Otion and Cineeas, Leacb. See Gonchodeema. 



GTMNOSOMATA. Bl. Tbe second family of tbe order Aporo- 

 brancbiata, in tbe system of De BlainviUe. Tbe animals belong- 

 ing to tbis family are destitute of sbeUs. 



GYPIDEA. Dalman. A genus of Bracbiopoda, tbus described, 

 " Larger valve witb tbe umbo rostrated, remote from tbe binge ; 

 witb tbe canal large, deltoid; bilocular witbin." Pentameefs, 

 Sow, G. Concbidium, copied from Dalman. PL xi. figs. 210, 211. 



GTBOGONA. Lam. A genus of microscopic Eoraminifera. 



GTEOIDINA. D'Orb. A genus of microscopic Eoraminifera. 



HALIA. Eisso. Peiamus, Beck. Eig. 545. 



HALIOTID^. Sw. A sub-genus of Calyptrsea. CALTPTEiEA 

 dilatata. Sowerby's Genera of Sbells, fig. 9. 



HALIOTIS. Liuneseus. (aXg, als, sea; ovg, wtoq, otos, ear.) 

 Fam. Macrostomata, Lam. Otides, BL — Descr. Auriform, 

 broad, depressed, pearly witbin, rougb, costated, tuberculated 



witbout ; spire sbort, flat, consisting of one or two wborla ; 



M 2 



