40 MOLLUSCA FROM THE CRAG. 



12. Pecten Islandicus, Miiller, Tab. V, fig. 1. 



Pecten Islandicus. Mull. Zool. Dan. Prod., p. 248, No. 2990, 1776. 



— — Chem. Conch. Cab., vii, p. 314, pi. 65, figs. 615-16, 1/82. 



— — Brown. Illust. Conch. Gr. Brit., pi. 33, fig. 3, 1827. 



— — Flem. Brit. An., p. 385, 1828. 



— — Desk. 2d ed. Lam., vii, p. 145, 1836. 



— — Gould. Invert. Massach., p. 133, fig. 87, 1841. 



— — Moller. Ind. Moll. Green., p. 16, 1842. 



— — G. Sow. Thesaur. Conch., vol. i, p. 75, pi. 17, figs. 159-160, 1843. 

 — Dekay. Nat. Hist. New York Zool., p. 173, pi. 11, fig. 206, 1843. 



— — LovSn. Ind. Moll. Scand., p. 30, 1846. 



— — Chenu. Conch. Illust. Pecten., pi. 32, figs. 1 — 4. 



— — Fori, and Hani. Hist. Brit. Moll., vol. ii, p. 303, 1849. 



— Middendorff. Mem. de l'Acad. des Sci. St. Petersb., p. 526, t. 12, 



figs. 7-8, 1849. 



— — G. B. Sow., Jr. Thesaur. Conch., vol. i, p. 75, pi. 17, figs. 159 — 161, 



1847. 

 Ostrea Islandica. Gmel. Syst. Nat., p. 3326, 1788. 



— — Turt. ed. Linn., vol. iv, p. 267. 



— — Shaw. Zool. Misc., vol. xxiii, t. 978, 987. 



_ _ W. Wood. Ind. Test., p. 49, pi. 10, fig. 21, 1825. 



— cinnabarina. Born. Mus. Cces. Vind., p. 103, 1780. 



— — Dillwyn. Desc. Cat. Rec. Shells, p. 256, 1817. 

 Pecten Pealii. Conrad. Amer. Mar. Conch., p. 12, pi. 2, fig. 2, (fide Gould). 



Ency. Method., pi. 212, fig. 1. 

 Lister. Hist. Conch., pi. 1057, fig. 4. 



Spec. Char. Testa suborbiculari, aquilaterali, convexiusculd, subaquivalvi, radiatd, 

 radiis numerosissimis, bisulcatis, scabriusculis ; auriculis inaqualibm. 



Shell suborbicular, equilateral, slightly convex, subequivalve, covered with nume- 

 rous close-set, somewhat scabrous bisulcated rays or costulated striae ; auricles 

 unequal. 



Locality. Clyde Beds. 



Recent, Scandinavia, Greenland, and North American Seas. 



This handsome shell is rejected by British Conchologists, as a living inhabitant of 

 our own Seas, it must necessarily, therefore, fall into the hands of the British 

 Palaeontographist, as a fossil species, it being abundant in the Clyde Beds. Dead 

 valves have been dredged up in the Scottish and Zetland Seas, from depths varying 

 from thirty to one hundred fathoms. 



It is, essentially, a Boreal species, and is found living upon the Banks of New- 

 foundland, where it is said by Dr. Gould, to be the favorite food of fishes. I have 

 not as yet seen a specimen from any of the three Formations into which the Crag has 

 been separated, although fragments of what may belong to this species have been 

 found in the Mammaliferous Crag, at Bramerton, and what were considered to 



