PECTEN. 299 



to Gibraltar (M'Andrew). As a fossil it occurs, though 

 rarely, in the northern drift. 



P. oPERcuLABis, Linuseus. 



Subequivalve, suborbicular, rather strong, rarely speckled ; folds 

 about twenty ; surface minutely radiated with closely disposed 

 rows of scales ; ears nearly equal. 



Plate L. fig. 3 ; LI. f, .5, 6 ; LIII. f. 7. 



List. Historia Conch, pi. 190, 191. — Knorr, Delices des 

 Yeux, pt. V. pi, 28, f. 4. 

 Osirea opercidaris, Linn. Syst. Nat. p. 1147. — Pulteney, Hutchins, Hist, Dor- 

 set, p. 36. — Maton and Rack. Linn, Trans, vol. viii. p. 

 98; Dorset Catalog, p. 38, pi, 9, f, 1, 2, 4, 5, — Turt, 

 Conch. Diction, p. 129, f. 74, — Born, Testacea Mus. Caes, 

 Vind, p. 106, — Schroter, Einleit, Conch, vol. iii. p. 317, 

 pi, 9, f. 3. — Gmelin, Syst. Nat. p. 3325, — Dillw, Re- 

 cent Shells, vol. i. p, 2C6, — Index Testaceolog, pi. 10, 

 f, 43, 

 „ sithrufa, Penn, Brit, Zool, ed, 4, vol, iv, p, 100, pi. 60, f, 63. — Donov, 

 Brit, SheUsjVol, i,pl. 12, 

 Peden pictus. Da Costa, Brit. Conch, p. 144, pi. 9, f. 1, 2, 4, 5, 

 „ lineatus. Da Costa, Brit. Conch, p, 147, pi. 10, f, 8. — Mont, Test, Brit, 

 pp, 147, 579. — Fleming, Brit, Anim, p, 383, — Lam, Anim. 

 s. Vert, (ed, Desh.) vol, vi, p. 143, 

 „ opercidaris^ Chemn, Conch. Cab, vol, vii. p, 341, pi, 67, f. 646. — Mont. 

 Test. Brit, p, 145.— Turt, DithjTa Brit, p, 209.— Flem- 

 ing, Brit. Anim. p. 383. — Macgilliv, Moll, Aberd. p, 

 224. — Brit. Marine Conch, p, 115, — Brown, Illust, 

 Conch. G. B. p. 71, pi, 24, f. 1. — Alder, Catal. Moll. 

 Northumb, and Durh, p, 76, — Lam, Anim. s. Vert, (ed, 

 Desh,) vol, vi. p. 142. — Philippi, Moll, Sicil, vol, i, p, 82, 

 and vol, ii. p, 57, — Sowerby, Thesaur, Conch, vol, i, p, 

 53, pi. 17, f, 141 to 146,— Hanl, Recent Shells, vol, i. p, 

 272, pi, 10, f, 43.— Chenu, Illust, Conch, Pecten, pi, 29. 

 — CuviER, Regne Anim, (ed, Croch.) pi. 75, f. 3, 

 Osirea sa7iguinea, PoLi, Test, Sicil, vol, ii, pi. 28, f, 7, 8. 

 „ lineata, Pulteney, Hutchins, Hist. Dorset, p. 36. — Donov. Brit, Shells, 

 vol, iv, pi, 116, — Maton and Rack, Linn, Trans, vol. viii. p, 

 99 ; Rack, Dorset Catalog, p. 38, pi. 10, f. 8,— Dillw, Recent 

 Shells, vol. i. p. 267. — Index Testaceolog. pi. 10, f, 44, 

 Pcctcii sanguineus, CosTA, Test. Sicil, p. 50, 



