156 HAMITES. 



with the umbo prominent, incurved ; upper valve small, flat, 

 opercular ; hinge toothless, with a curved, depressed area ; one 

 muscular impression. — Obs. These shells, which approach the 

 Oysters, are of a more regular form, and are remarkable for the 

 curved, produced beak of the lower valve. They are only known 

 in a fossil state, belonging to the more ancient strata. Fig. 182, 

 G. incurva. The recent species mentioned by Lamarck is not a 

 true Gryphsea. 



GYMNOLEPAS. A generic name used by De Blainville to include 

 Otion and Cineras, Leach. 



GYMNOSOMATA. Bl. The second family of the order Aporo- 

 branchiata, in the system of De Blainville. The animals belonging 

 to this family are destitute of shells. 



GYPIDEA. Dalman. A genus of Brachiopoda, thus described, 

 " Larger valve with the umbo rostrated, remote from the hinge ; 

 with the canal large, deltoid ; bilocular within. " Pentamerus, 

 Sow. Fig. 210. 211, G. Conchidium, copied from Dalman. 



GYKOGONA. Lam. A genus of microscopic Foraminifera. 



GYROIDINA. D'Orb. A genus of microscopic Foraminifera. 



HALIOTlDiE. Sw. A sub-genus of Calyptrsea. Calyptrsea 

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



HALIOTIS. Auct. (aXe, als, sea ; ovg, wtoq, otos, ear.) Fam. 

 Macrostomata, Lam. Otides, Bl. — Descr. Auriform, broad, de- 

 pressed, pearly within, rough, costated, tuberculated without; 

 spire short, flat, consisting of one or two whorls ; aperture wide ; 

 ovate ; columella laminar, flat, obilque ; a spiral series of perfo- 

 rations running along the dorsal margin. — Obs. The splendid 

 shells belonging to this genus are remarkable for the pearly 

 iridescence of the inner surface, and the row of holes following 

 the course of the spire. The soft parts are eaten in Guernsey 

 and Jersey, and reckoned delicious. They belong to temperate 

 and tropical climates. Fig. 338, H. rubra. 339, Padollus, Montf. 



HALIOTOID. (Haliotis and uZoq, eidos, form.) Ear-shaped. 



HAMIFORM. {Ramus, a hook.) Curved at the extremity. 



HAMITES. Parkinson. (Hamus, a hook.) Fam. Ammonacea, 



