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Show 1882.] 'LIGHTNING' A N D ' P O R C U P I N E ' EXPEDITIONS. 657 ^ 'Porcupine' Exp. 1870: Atl. St. Vigo B., Tangier B.; Med. Cartagena B., 50, G. Bona, Benzert Road, G. Tunis, Adventure Bank. Distribution. Finisterre to the Archipelago and Sea of Marmara, Adriatic, Morocco, off Cape of Good Hope (' Challenger' Exp.), Canary Isles and Madeira; 0-150 fms. The Irish and Cornish localities mentioned in «British Conchology,' iii. pp. 196 & 197, are doubtful, although it is not improbable that this species may be found there as well as on the opposite coast of France. Mighels, in his ' Catalogue of the Shells of Maine,' gives " D . dentate," saying that a specimen had been taken from the stomach of a haddock caught far out at sea in very deep water. It is more likely to have been the D. striolatum of Stimpson. Fossil. Upper Tertiaries: Red and Coralline Crag, Antwerp, S. France, Italy, Morea, Archipelago. Post-tertiary : S. France. I have noted 18 synonyms, the principal being D. novemcostatum of Lamarck and D. costatum of J. Sowerby. D. striolatum of Risso is a variety, and must not be mistaken for Stimpson's species. The specific names dentalis and entalis are not adjectives. 2. DENTALIUM PANORMITANUM (panormum), Chenu. D. panormum, Chenu, 111. Conch, t. 6. f. 13 (1842-47); G. B. Sowerby, Thes. Conch, pl. ccxxiv. f. 18. ' Porcupine' Exp. 1869, St. 1, 45a, 456. 1870 : Atl. C. Sagres, 36 ; Med. Capo de Gata, off Jijeli, 55, Adventure Bank, 58. Distribution. Bay of Biscay ('Travailleur' Exp. 1880), Mediterranean and Adriatic; 30-195 fms. Fossil. Upper Tertiaries: Antwerp Crag, Italy and Sicily. Having examined and compared an extensive series of specimens from various places, I have come to the conclusion that, according to the received notions of a species, this must be considered distinct from D. dentalis and not merely a variety. Independently of the much greater length, the ribs are finer and far more numerous and regular, and they are extremely slight or become mere striae on the anterior part or in front. The shell is also more tapering and proportionally narrower. It attains the length of 3 or 4 inches. Some specimens have the same pipe at the posterior extremity as in D. dentalis. It appears to be D. pseudo-antalis of O. G. Costa (but not of Lamarck), D. pseudo-entalis of Scacchi (not of Deshayes), and D. lessoni of G. B. Sowerby (not of Deshayes) in part, D. arguticosta of Brugnone, and D. semiclausum of Nyst. As it has been in all probability confounded by other authors with D. dentalis, it is almost impossible to disentangle the synonymy of both these species. 3. DENTALIUM TARENTINUM, Lamarck. D. tarentinum, Lam. An. s. Vert. v. p. 345, var. B : B. C. iii. p. 195; v. p. J 97, pl. Iv. f. 2. 'Porcupine' Exp. 1869, St. Galway B. Distribution. West of Ireland, Holyhead, Cardigan B., and Bel- 44* |