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Show 558 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [June 17, Distribution. Loffoden I. to the Morea, Malta, and the Adriatic ; 20-470 fms. Fossil. Pliocene and Post-tertiary. Coralline Crag, Belgium, Biot, Messina ; 0-30 ft. Ostrea arata of Gmelin and P. bruei of Payraudeau. When I adopted Gmelin's specific name, I overlooked the relative dates of Miiller's and Born's publications ; that of Muller is anterior by two years, viz. 1776, while Born's was 1778. Miiller's description, although short, is unmistakable. 7. PECTEN OPERCULARIS, Linne. Ostrea opercularis, L. S. N . p. 1147. P. opercularis, B. C. ii. p. 59, pi. ii. f. 1 ; v. p. 166, pi. xxii. f. 3, 3a. 'Lightning' Exp.: St. 4. 'Porcupine' Exp. 1869: St. 2, 33, 35. 1870: Atl. 1, 2,3,8,9, 10, Setubal B., C. Sagres, 26, 36, Tangier B.; Med. 50, 55, G. Bona, Benzert Road, Rasel Amoush, G. Tunis, Adventure Bank, off Rinaldo's Chair. Specimens have a more or less strongly imbricated sculpture. Distribution. Iceland to the Sea of Marmora, Adriatic, Madeira, Canaries, and the Azores ; 5-205 fms. The depth recorded for the variety audouinii from the Mediterranean cable is questionable. Fossil. Pliocene and Post-tertiary. Scandinavia, Great Britain and Ireland, Belgium, N. Germany, S. France, Italy, Algeria, Morea, Rhodes, Madeira; 0-600 ft. 8. PECTEN PHILIPPII, Recluz. P. philippii, Reel. Journ. de Conch, iv. p. 52, t. ii. f. 15, 16 (1853). ' Porcupine' Exp. 1870 : Atl. St. Setubal B., C. Sagres, 26, 36 ; Med. 50, Benzert Road, Rasel Amoush. Distribution. Mediterranean, Adriatic, Madeira, Canaries ; 20- 100 fms. Fossil. Pliocene. S. Italy and Rhodes. Distinguishable from P. opercularis by its smaller size, more convex or gibbous shape, broader and flattened ribs, and smaller ears. Monterosato altered the specific name to commutatus, because philippii had been used by Michelotti praviously to Recluz for another and a fossil species; but, as Brugnone has lately pointed out, Michelotti's species belong to Pleuronectia or Amussium. According to Homes, that species is the Pecten duodecimlamellatus of Bronn, which has precedence of Michelotti's name by eight years. 9. PECTEN MAXIMUS, Linne. Ostrea maxima, L.S. N. p. 1144. P. maximus, B. C. ii. p. 73 ; v. p. 169, pi. xxiv. 'Porcupine' Exp. 1870: Atl. St. Vigo B., Tangier B.; Med. Algesiras B., G. Bona, Benzert Road. Young specimens. |