OCR Text |
Show 1881.] 'LIGHTNING'AND'PORCUPINE'EXPEDITIONS. 943 supports the adductor muscle on that side : scars otherwise inconspicuous. L. 0*4, B. 0*65. 'Porcupine' Exp. 1869: St. 39. 1870: Atl. 16, 17a. DistriBution. Off Gomera, Azores ('Challenger' Exp.) ; 620 fms. C. Keeled. TROPIDOPHORA. 17. N E ^ E R A ABBREVIATA, Forbes. N. aBBreviata, Forb. in Proc. Zool. Soc. 1843, p. 75 : B. C. iii. p. 48; v. p. 191, pi. xlix. f. 2. 'Porcupine' Exp. 1869: St. 10, 13, 18. 1870: Atl. 9, 36; Med. 55, Adventure Bank, off Rinaldo's Chair. DistriBution. Finmark to W . Scotland, W . France and Bay of Biscay, N. Spain, Mediterranean from Naples to the iEgean ; 4-552 fms. Fossil. Pliocene : Belgium, S. France, Sicily. N. vitrea of Loven, and CorBula reflexa of O. G. Costa according to Aradas and Benoit. The shell frequently wants the concentric plaits or folds. 18. NE^ERA ANGULARIS, Jeffreys. (Plate LXXI. fig. 9.) N. angularis, Jeffr. in Ann. & Mag. N. H. Dec. 1876, p. 498. 'Porcupine' Exp. 1870: Atl. St. 16, 17, 17a. A living specimen and a few valves. DistriBution. G. Mexico (Pourtales), N. Atlantic (' Valorous ' Exp.); 290-1785 fms. A lovely shell. D. Ribbed lengthwise. SPATHOPHORA. 19. N E ; E R A CURTA', Jeffreys. (Plate L X X I . fig. 10.) N. curta, Jeffr. in Ann. & Mag. N. H . Dec. 1876, p. 495. S H E L L roundish-oval, with an oblique outline, globose, thin, opaque, and lustreless, but semitransparent and glossy when young: sculpture, numerous longitudinal sharp ribs on the posterior side, and strise in the same direction on the other side, as well as usually on the rostrum ; the sculpture of the rostrum, however, is irregular, sometimes consisting of a single transverse riblet, and in other specimens of more than a dozen strise, and occasionally the rostrum is quite smooth ; there are also close-set and wavy concentric lines of growth, which are crossed by the longitudinal sculpture : colour white: margins rounded on the anterior side, with an oblique trun-cature above, gently curved in front; rostrum short, abruptly pinched up and rounded at the point; dorsal margin on a level with the umbo on the anterior side and incurved on the other side: Beaks minute, inflected, and sunk; umbones prominent: cartilage-pit small, triangular, placed immediately below the beaks: hinge-line flexuous : hinge-plate thin and reflected on the anterior side, thickened on the posterior side : teeth, a short strong triangular lateral 1 Short. |