296 OSTREAD^. 



ings wlien they lUce). Off Cape Clear in sixty fathoms 

 (M' Andrew) ; oiF entrance of Belfast Lough in thirty 

 to thirty-five fathoms (Thompson.) It ranges throughout 

 the European seas, and is found fossil in the coralline 

 crag (Wood). 



P. MAxiMus, Linnseus. 



Very inequivalve; upper valve concave at the umbones ; under 

 valve very convex. 



Plate XLIX. 



Lister, Anim. Angl. pi. 4, f. 29; Hist. Conch, pi. 163. — 

 Knorr, Delices des Yeux, pt. 2, pi. 14, f. 1. 

 Ostrca maxima, Linn. Sj'st. Nat. p. 1144; Fauna Suecica, p. 520. — Pulteney, 

 Hutchins, Hist. Dorset, p. 35. — Donov. Brit. Shells, vol. ii. 

 p. 49. — Maton and Rack. Trans. Linn. Soc. vol. viii. p. Q6; 

 Dorset Catalog, p. 37, pi. 9, f. 3. — Turt. Conch. Diction, 

 p. 128. — Born, Mus. Caes. Vind. p. 98. — Dillw. Recent 

 Shells, vol. i. p. 247. — Index Testaceolog. pi. 10, f. 1. 

 Pecteti maodmus, Penn. Brit. Zool. ed. 4, vol. iv. p. 99, pi. 59, f. 61. — Mont. 

 Test. Brit. p. 143.— Turt. Dithj'ra Brit. p. 207.— Fleming, 

 Brit. Anim. p. 383. — Macgilliv. Moll. Aberdeens. p. 223. — 

 Brit. Marine Conch, p. 115. — Brown, lUust. Conch. G. B. 

 p. 71, pi. 25, f. L— Chemn. Conch. Cab. vol. vii. p. 268, pi. 

 60, f. 585. — Lam, Anim. s. Vert. (ed. Desh.) vol. vii. p. 129. 

 — Crouch, Introd. Lam. Conch, pi. 12, f. 3. — Sowerbv, 

 Thesaur. Conch, vol. i. p. 45, pi. 15, f. 98 to 100.— Hanl. 

 Recent Shells, vol. i. p. 268, pi. 10, f. 1. 

 " vulgaris. Da Costa, Brit. Conch, p. 140, pi. 9, f. 3. 

 " loevis, Macgilliv, Moll. Aberdeen, p. 227 (probably). 



The great edible Scallop is a large and handsome shell. 

 It is suborbicular, strong, occasionally heavy, and very in- 

 equivalve; the lower valve being ventricose, whilst the upper 

 one is shorter at the ventral margin, flat but depressed at 

 the umbo in the adult, and entirely concave in the young. 

 From about fourteen to sixteen broadish and rounded 

 ribs diverge from the umbo of the lower or more con- 



