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Show 1881.] 'LIGHTNING'AND'PORCUPINE'EXPEDITIONS. 939 Atl. 6, 9, 13, 17, 24, 25, C. Sagres, 27-28a, 36 ; Med. Capo Gata, Cartagena B., 55, Adventure Bank, off Rinaldo's Chair. DistriBution. Loffoden Is. to Shetland and the North Sea, Bay of Biscay, Mediterranean and Adriatic, New England, G. Mexico, off Barbadoes ('Blake' Exp.), off Patagonia ; 10-645 fms. Fossil. Miocene: N.W. Germany. Pliocene: Monte Mario and Sicily. Closely allied to N. chinensis of Gray. According to Aradas and Benoit the present species is N. ardiniana of Biondi. The animal is pale yellowish-white: mantle having its edges pouting and folded back : tuBe cylindrical, extensile, and white, fringed with a few short cirri, which are bulbous at their extremities : foot tongue-shaped, white. 8. NE^ERA BICARINATA1, Jeffreys. (Plate LXXI. fig. 1.) N. Bicarinata, Jeffr. in Ann. & Mag. N. H. Dec. 1876, p. 496. S H E L L slightly inequivalve, pear-shaped, somewhat compressed, thin, semitransparent, and glossy : sculpture, irregular coucentric strise, which in a fragment of a larger specimen become wrinkles; the rostrum has two slight ridges or keels running outwards from the beak, the upper being nearly parallel with the hinge-line, and the lower forming with it an acute angle: colour whitish: margins rounded on the anterior side, having a less degree of curvature in front; the rostrum or posterior side is defined by a shallow indentation ; it is broad and angular, with a blunt point; dorsal margin straight: Beaks calyciform, incurved towards the anterior side; umbones slightly prominent: cartilage-pit small, obliquely oval: hinge-line straight: hinge-plate thin, except under the beak: teeth, a short and nearly erect lateral on the posterior side of the right valve: inside glossy : muscular scar on the posterior side triangular and distinct. L. 0*3, B. 0*45. 'Porcupine' Exp. 1870: Atl. St. 16, 17 (valves). DistriBution. North Atlantic ('Valorous ' Exp.; a fragment), Bay of Biscay ('Travailleur' Exp.); 690-733 fms. 9. NEJERA TERES2, Jeffreys. (Plate LXXI. fig. 2.) S H E L L triangular, convex, thin, semitransparent and glossy: sculpture, smooth, with the exception of some wrinkly strise across the rostrum and a ridge or keel extending diagonally from the beak to the lower extremity of the rostrum ; occasionally there is a second but fainter ridge, as in the last species : colour whitish : epidermis thin, light yellowish-brown : margins rounded on the anterior side and in front; rostrum short, separated or defined by a slight indentation, and ending in a somewhat truncated point ; dorsal margin nearly straight: Beaks small, calyciform, incurved anteriorly; umbones prominent: cartilage-pit small, oblong, and placed obliquely : hinge-line raised on the anterior, and somewhat incurved on the posterior side: teeth, a short triangular lateral on each side of the 1 Pouble-keeled. 2 Bounded off. |