417 ed, with fine transverse strice; inches long, 53 broad: ears large, with decussated strize; lower valve convex, white, often varied with red bands or spots; upper valve flat, reddish. Found in large beds in most EuTopenn seas, where they are dredged up, pickled, and barrelled for sale, It is said, that the greatest quantity is taken after a fall of snow. This is the shell worn formerly by pilgrims on the bat or coat, as a mark that they had. crossed the sea for the purpose of paying their devotion to the Holy Land; in commemoration of this it is still preserved in the arms of many families. Donovan, t. 49. . 2. With about 14 angular and longitudinally striated yacobaa. rays; upper valves flat, with rounded rays, which are finely striated transversely ; lower valve with angular rays, which are striated longitudinally. Ears concave and smooth on the upper side. European seaz, Dorsetshire, but rare. Don. t. 137.

3With 18 flattened rays; ears finely wrinkled ; xic-xac. lower valve convex ; rays finely striated transversely ; upper valve flat, with about twice as many angular lines . there are rays. American ocean. Lister, t. 168, . With 16 faint rays, and transverse membranastriatula. ceous strize ; margin very entire ; valves nearly equally flat. Indian ocean. 5. With 20 convex rays; lower valve white and minuta. very convex ; upper valve white, clouded with brown, flatter and plaited. Indian ocean. 6. Equivalve, with 12 doubled rays, and smooth on pleuronccthe outside; 4% inches long, gaping at each end. Intes. dian ocean. Chem. vii. t. 61. f. 595. 7Equivalve, a little convex, margined with yel-yaponica. low; upper valve with faint lines crossing transverse concentric bands, and 48 elevated strie within; sf inches long, about the same breadth. Goinea and Japan. Chem. vii. t. 62. f. 596.

8. Equivalve, glabrous, with oblong crowded strise ; magellantupper valve more convex, lower flatter than in most ca. others. Straits of Magellan. Chem. vii. t. 62. f. 597. g. With 9 or 10 rays; the interstices longitudinally Aybrida. striated ; margin repand within. Norway seas. Chem. vii. t. 63. f. Gor. and 602. to. Nearly equivalve ; with 12 convex rays crossed radula. by crenated strize ; 33 inches long, 2% broad. Indian ocean. Lister, t. 175. f. 12. 11. Equivalve, flattish, with 9 unequal rays, imbri-smbricata. cated with scales. Red sea. Chem. vii. t. 69. f. G. 12. Nearly equivalve, with 16 convex smoothish plica. rays, and striated across; 1% inch long, 1 inch broad.

India. Chem. vii. t. 62. f. 598. 13. Somewhat wedge-shaped, with six convex ribs pes /utra. and longitudinal stri; auricles small and unequal. Lister, t. 171. f. 8 ** Valves with the auricles equal. 14. Ducal mantle. Equivalve, with 12 convex rays, paliiwm. striated, rough, and imbricated with scales ; red, varied 3G 17. With 418 nodosa. pes felis, pellucens. obliterata. suleata. senatoria, exotica. sanguinea snuosa. epercilarts, kneata, , nucleus.