PECTEN. 305 



date to Fabricius, the merit of first describing this shell 

 adequately belongs assuredly to the latter; indeed the 

 diagnoses in the " Prodromus" are far too brief to enable 

 us to distinguish the species mentioned from their allied 

 exotic congeners, however sufficient for the discrimination 

 of them from those which inhabit the same shores. 



Pecten islandicus is an abundant fossil in the pleistocene 

 beds of the Clyde, and may be found in numbers at low 

 water in the Kyles of Bute, as observed by Mr. Smith 

 of Jordanhill. It has been dredged always as dead valves 

 and as if fossil in various depths of water, as off Skye in 

 forty fathoms, near Mull in ninety fathoms, and off Zetland 

 in one hundred fathoms (M'Andrew). Also in thirty- 

 five fathoms off Aberdeen (Thomas) where, Professor Mac- 

 gillivray states, dead valves are common. It is a living 

 inhabitant of the Norwegian, Greenland, and Boreal Ame- 

 rican Seas. 



SPURIOUS. 

 P. Jacoh.eus, Linnaeus. 



Ostrea Jacobaa, Linn, (not Turt. Conch. Diction.) Syst. Nat. ed. 12, p. 1144; 



Mus. Ulric. p. 522. — Pulteney, Hutchins, Hist. Dorset, p. 



36. — Donovan, Brit. Shells, vol. iv. pi. 137. — Maton and 



Rack. Linn. Trans, vol. viii. p. 97. — Rack. Dorset Catalog. 



p 37, pi. 13, f. 2. — Born, Mus. Caes. Vind. p. 98.— Poli, 



Test. Sicil. vol. ii. p. 149, pi. 27. — Dillw. Recent Shells, 



vol. i. p. 248. 

 Pecten Jucobceus, Penn. (not Fleming), Brit. Zool. ed. 4, vol. iv. p. 100, pi. GO, 



f. 62.— Da Costa, Brit. Conch, p. 143.— Mont. Test. Brit. 



p. 144. — Turt. Dithyra Brit. p. 207. — Brown, Illust. Conch. 



G. B. p. 71, pi. 24, f. 5. — Lam. Anim. s. Vert. (ed. Desh.) 



vol. vi. p. 130. — Philippi, Moll. Sicil. vol. i. p. 78, and vol. 



ii. p. 56. — Sowerby, Thesaur. Conch, vol. i. p. 46, pi. 15, f. 



107, 108, and pi. 17, f. 153.— Hanley, Recent Shells, vol. 



i. p. 269. — Cuvier, Regne Anim. (ed. Croch.) pi. 75, t'. 2. 

 „ Jacobi, Chemn. Conch. Cab. vol. vii. p. 273, pi. 60, f. 588. 

 Encyclop. Methodique, Vers. pi. 209, f. 2. 



VOL. II. R R 



