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Show 1 12 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Mar. 6, •Porcupine'Exp. 1870: Atl. St. 16, 17, 17a. Five specimens, more or less imperfect but characteristic. 5. CITHNA NATICIFORMIS l, Jeffreys. (Plate XX. fig. 11.) S H E L L obtusely triangular with an eccentric spire, thin, semitransparent, and glossy : sculpture, a few rather strong spiral stria? on the base or underside, besides the usual umbilical ridge : colour white ; spire very short: whorls 3, convex, the last occupying three fourths of the shell; apex bulbous : suture very deep : mouth nearly circular, large and expanding: outer lip thin, angulated above: inner lip filmy: umbilicus large, enclosed by a sharp curved ridge or stria (sometimes by an outer and an inner stria), and ending in a small but deep perforation. L. 0*075, B. 0*1125. 'Porcupine' Exp. 1870: Atl. St. 17a. Three more or less imperfect specimens. This differs from the last species in shape, sculpture, shorter spire, and fewer whorls. 1. LITTORINA OBTUSATA, Linne. Turbo obtusata, L. S. N. p. 1232. L. obtusatus, B. C. iii. p. 356; v. p. 205, pi. Ixv. f. 1. ' Porcupine' Exp. 1869 : St. 9. Dead, and probably drifted by a current or voided by a fish. Bistribution. Yenissei G., Novaia Zemblia, White Sea, Iceland, Faroes, Finmark to Gibraltar, Mediterranean?, Azores (McAndrew), Davis Strait to New York ; 0-15 fms. Living in the littoral and laminarian zones. The recorded localities in the Mediterranean are Toulon (Gay), S. France (Petit, fide Michaud), Malaga (McAndrew)\, Ajaccio (Requien), Corsica (Susi?ii) !, and Sicily (Philippi, Bivona, Gemellaro, and others). Fossil. Post-tertiary : Scandinavia, British Isles, S.W. France, and Canada; 0-1360 ft. Principal synonyms-Nerita littoralis, Linne, Turbo relusus, Lamarck, and Littorina arctica, Moller ; and as some of the varieties T. palliatus, Say, T. fabatis, Turton, and L. limata, Loven. Mr. Duprey found in Jersey a monstrous specimen which had 3 tentacles and 3 eyes. The middle tentacle was bifid ; and the eye belonging to it was double and presented two small points in juxtaposition. The other eyes were simple or regular. 2. LITTORINA RUDIS, Maton. Turbo rudis, Mat. Nat. Hist, and Antiq. West. Counties, 1797, p. 277. L. rudis, B. C. iii. p. 364 ; v. p. 206, pi. Ixv. f. 3, 3 a, 3 b. ' Lightning ' Exp. St. 5. Probably drifted. ' Porcupine ' Exp. 18*69 : Donegal B., Lough Swilly. 1870 : Atl. Vigo B. Bistribution. Coasts of N. Atlantic on both sides, from Spitzbergen to Lisbon and Davis Strait to Staten I. in the U.S., Iceland, Van- 1 Shaped like a Natica. |
