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Show 556 DR; GWYN JEFFREYS ON THE MOLLUSCA OF THE [June 1 7, Family III. SPONDYLID^E. SPONDYLUS GUSSONI, O. G. Costa. S. gussonii, O. G. Costa, Cat. Sist. p. xiii: Philippi, Moll. Sic. i. p. 87, t. v. f. 16. 'Porcupine' Exp.'1870: Atl. St. 16, 24, 25; Med. 45, Capo de Gata, 58. Distribution. Mediterranean, Adriatic, and iEgean ; 40-120 fms. Fossil. Pliocene. Metz, Biot, Sicily. S. geederopus did not occur ; and it will be seen that many other equally common shells were not procured during any of these Expeditions. Family IV. PECTINID^E. 1. P E C T E N PUSIO, Linne. Ostrea pusio, L. S. N. 1146. P. pusio, B. C. ii. p. 51 ; v. p. 166, pi. xxii. f. 1. 'Lightning' Exp.: St. 4. 'Porcupine' Exp. 1869: 2. 1870: Atl. Vigo B., 36 (Hinnites form), Tangier B.; Med. Capo de Gata, 55. Distribution. Faroe Isles to Morocco and the Mediterranean, Adriatic, iEgean, Madeira, Canaries, Azores, and S. Africa; 0-180 fms. Fossil. Pliocene and Post-tertiary. Scandinavia, Great Britain and Ireland, Belgium, Transylvania, S. France, Algiers, Italy, and Rhodes; 0-130 ft. Several synonyms, including P. distortus of Da Costa and P. mul-tistriatus of Poli. I have here endeavoured, as on former occasions, to arrange the species in their natural sequence, so as to show their relative affinity. In the ' Porcupine' Expedition of 1870, I dredged at Station 9 (509 fms.) a fragment of a Pecten, apparently allied to P. pusio, but representing a shell about an inch and a half in length, and at Station 16 (994 fms.) a very small valve of the same species. It has numerous ribs, which are alternately larger and smaller, and covered with numerous close-set prickles or imbricated scales. I would provisionally name this species senticosus. 2. PECTEN VARIUS, Linne. Ostrea varia, L. S. N. p. 1146. P. varius, B. C. ii. p. 53 ; v. p. 166, pi. xxii. f. 2. ' Porcupine ' Exp. 1869 : Loch Foyle. 1870 : Atl. Tangier B. Distribution. Christiansund to Egypt and Gulf of Suez; 0-55 fms. Fossil. Miocene. Turin. Pliocene and Post-tertiary. Scandinavia, Great Britain and Ireland, S. France, Italy, Algeria, Morea, and Rhodes; 0-150 ft. 3. PECTEN ISLANDICUS, Muller. P. islandicus, Mull. Zool. Dan. Prodr. p. 248 : G. O. Sars, Moll. reg. arct. Norv. t. 2. f. 2. 'Porcupine' Exp. 1869: St. 25 (fragments; semifossil ?). |