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Show 1885.] 'LIGHTNING' AND ' PORCUPINE' EXPEDITIONS. 33 with the young of any other species known to me, and I have therefore named and characterized this species provisionally. 10. NATICA GLOBOSA1, Jeffreys. (Plate IV. figs. 4, 4 a.) S H E L L globular, thin and fragile, semitransparent, and glossy : sculpture, only some slight and close-set spiral striae which may be seen under a microscope: colour white with a faint tinge of yellowish-brown : spire short and pointed: whorls 4, tumid and compact; the largest occupies f of the spire : suture rather deep : mouth oval, somewhat expanded, contracted and angular above, rounded below : outer lip nearly semicircular, thin-edged : inner lip narrow, flexuous, attached above to the pillar, and folded over the umbilicus, which consists of a narrow slit. L. O'l, B. 0*075. 'Porcupine' Exp. 1870: Atl. St. 16, 17a; Med. 55. Distribution. Marocco and C. Verd I. (' Talisman' Exp.) ; 1192-1980 fms. B. Umbilicus more or less covered by a callus. Neverita, Risso. 11. N A T I C A C O M P A C T A 2 , Jeffreys. (Plate IV. figs. 5, 5 a.) S H E L L globular, thick, opaque, somewhat glossy : sculpture, a few microscopical spiral striae, which are chiefly perceptible on the base : colour light yellowish-brown: spire short, turreted; apex blunt : whorls 4, convex, rapidly enlarging, shouldered below the suture ; the last occupies £ of the spire : suture wide, slightly channelled: mouth oval, equal in length to f of the spire : outer lip inflected above: inner lip thickened on the pillar and at the base, not forming a pad as in many of the other species : umbilicus concealed or closed by the inner lip. L. 0-35, B. 0'3. 'Lightning' Exp.: St. 7. 'Porcupine'Exp. 1869 : 23, 23 a, 30. 1870: Atl. 16, 17, 17 a. Differs from N. montacuti in having a turreted spire, and especially in the closed umbilicus. The very young are shaped like the adult, but the umbilicus is open and free in consequence of the inner lip not having been yet formed and spread over the pillar. 12. NATICA OBTUSA 3, Jeffreys. (Plate IV. figs. 6, 6a.) S H E L L oval, with an oblique outline, rather thick, opaque, and glossy in the living state : sculpture, slight and curved striae in the line of growth, which are stronger below the suture in each whorl: colour whitish: spire short, apex very blunt: whorls 4, somewhat compressed, but not flattened ; the last occupies § of the spire : suture slight and shallow : mouth oval, acutely angulated above: outer lip thick-edged: inner lip thickened in the only adult specimen, and completely covering the umbilicus, which is partly visible in a half-grown specimen. L. 0*3, B. 0*3. 'Porcupine' Exp. 1870: Atl. St. 16, 17. i Globular. 2 Compact together. 3 Blunt. PROC. ZOOL. SOC-1885, No. III. 3 |
