I'ECTEN. 299 



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

 rarely, in the northern drift. 



P. operculars, Linnseus. 



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, C ; LIII. f. 7. 



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

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

 Ottrea opercularis, Linn. Syst. Nat. p. 1147. — Pultenev, Hutchins, Hist. Dor- 

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

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

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

 Vind. p. 10C. — Schroter, Einleit. Conch, vol. iii. p. 317, 

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

 cent Shells, vol. i. p. 266. — Index Testaceolog. pi. 10, 

 f. 43. 

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

 Brit. Shells, vol. i. pi. 12. 

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

 „ liucatus, 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. 

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

 Test. Brit. p. 145.— Turt. Dithyra 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. 

 Ostrea sanguinea, Poli, Test. Sicil. vol. ii. pi. 28, f. 7, 8. 



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

 vol. iv. pi. 1 16. — 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. 

 Pecien sanguineus, Costa, Test. Sicil. p. 50. 



