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Show 722 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [June 7, covering more especially the angle of the posterior side : margins somewhat rounded in front, with an oblique slope towards the posterior side, curved on the anterior side, and obliquely truncated with an angular and broadish area on the posterior side, where it slightly gapes at the end, dorsal margin gently sloping from the beak on each side, so as to form an obtuse angle : Beaks small, slightly incurved, placed at a distance of about two fifths from the posterior end: ligament short, prominent, light horn-colour: hinge-line obtusely angular: hinge-plate rather thick and strong, interrupted or discontinued halfway on the posterior side: teeth, in the right valve two short but stout divergent cardinals, that on the posterior side being slightly cloven, besides a short lateral on each side ; in the left valve there are also two cardinals, that on the anterior side being larger than the other and also slightly cloven ; the tooth on the anterior side is slight and curved ; this valve has no lateral tooth : inside highly polished and glossy, exhibiting the longitudinal rays and white lines: pallial and muscular scars conspicuous, the latter large. L. 0*3, B. 0*55. 'Porcupine' Exp. 1870: Atl. St. C. Sagres. Two perfect specimens and several valves. This shell is thinner and more delicate than T. donacina; and it also differs from that species in the sculpture, colour, and broad posterior angle. It connects Tellina with PsammoBia. 1. PSAMMOBIA FERROENSIS, Chemnitz. Tellina Jerrvensis, Chemn. Conch.-Cab. vi. p. 99, t. 10. f. 91. Psammobia ferroensis, B. C. ii. p. 396 ; v. p. 187, pi. xiii. f. 3. ' Porcupine' Exp. 1869 : St. 13, 18, 25, off Lerwick. 1870 : Atl. C. Sagres, Tangier B.; Med. Algesiras B., Cartagena B., 50, 55, Benzert Road, Adventure Bank. Distribution. Iceland and Finmark to iEgean and Sea of Marmora, Adriatic, Canaries; 0-90 fms. Fossil. Miocene: S.W. France. Upper Tertiaries: Coralline Crag, Belgium, S. France, Italy, Cos, Rhodes. Post-tertiary: Norway, N. England and Ireland, Calabria; 0-600 ft. For synonymy see ' British Conchology.' 2. PSAMMOBIA COSTULATA, Turton. P. costulata, Turt. Conch. Dith. p. 87, t. 6. f. 8 : B. C. ii. p. 394 ; v. p. 187, pi. xiii. f. 2. ' Lightning ' Exp. St. 2. 'Porcupine' Exp. 1869: St. 13. 1870: Atl. C. Sagres, Tangier B. Distribution. Norway to the Archipelago, Adriatic, Mogador, Madeira, Canaries ; 0-120 fms. Fossil. Upper Tertiaries: Coralline Crag, Italy, Rhodes. Post-tertiary : Calabria. A specimen dredged at Oban by Admiral Bedford is more than an inch wide. |