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Show 1882.] 'LIGHTNING' A N D 'PORCUPINE' EXPEDITIONS. 659 Bay of Biscay (* Travailleur' Exp.), Mediterranean (Spratt and others), Adriatic (Stossich), Azores ('Josephine' Exp.), Canaries (' Challenger ' Exp.), G. Mexico (Dall), New England and Maine (Verrill fy Packard) ; 30-1963 fms. Fossil. Upper Tertiaries : S. Italy, Sicily, and Rhodes. Prof. G. O. Sars was right in distinguishing this species from D. striolatum ; and I was wrong in uniting them, although other naturalists may not be satisfied. The shell is usually smooth, but sometimes more or less strongly striated lengthwise towards the point. A specimen from the west of Ireland is more than 3 inches long. See also my remarks in the Ann. & Mag. N. H. for Feb. 1877 and July 1882. It is the D. incertum of Philippi but not of Deshayes, D. striatum of Scacchi, and D. lacteum of 0. G. Costa but not of Deshayes. 7. DENTALIUM STRIOLATUM, Stimpson. D. striolatum, Stimps. Proc. Boston Soc. Nat. Hist. 1851, p. 114. ' Lightning' Exp., St. 5, 7. 'Porcupine' Exp. 1869 : St. 3, 23a, Little Minch. Distribution. From Spitzbergen and the Faroe Islands to the Bay of Biscay and the Azores, the Mediterranean, as well as all along the eastern coasts of North America from Newfoundland to Maine, off Valentia with D. entalis; 10-570 fms. Fossil. Pliocene : Sicily. Post-tertiary : Norway, Scotland, North of England; 0-1360 ft. As Mr. Norman justly remarked in the ' Journal of Conchology ' for Jan. 1879, it is very difficult to distinguish some Norwegian specimens of D. striolatum from D. entalis. I will not say they may not be the same species. The principal difference seems to consist in the present species being less regularly cylindrical and being abruptly pinched up near the point, as well as in the longitudinal stria? at that end. It is unmistakably the same species as D. abyssorum of M. Sars, 1858, as he afterwards admitted. Besides the latter synonym, it is the D. breviflssum of Brugnone, but not of Deshayes or Nyst. Professor Whiteaves, in 1874, regarded D. attenuatum of Say as identical with D. dentalis of Gould and D. abyssorum of Sars. Judging from specimens named by Professor Verrill " Dentalium occidentale, Stimpson " (D. dentalis, Gould), this is another synonym, the specimens belonging to a more strongly ribbed variety of the present species. Not D. striolatum of Risso, 1826, which is a variety of D. dentalis. 8. DENTALIUM ENTALIS, Linne. D. entalis, L. S. N. p. 1263: B. C. iii. p. 191, pl. v. f. 1 ; v. p. 197, pl. Iv. f. 1. 'Lightning' Exp., St. 2, 3, 4, 5. 'Porcupine' Exp. 1869 : St. 1, 2, 6, 9, 13, 14, 18, 24, 25, 33, 35, 45a, 456, 64, 68, The Minch, Little Minch. 1870 : Atl. 30. Distribution. Iceland, Northern Russia, and Scandinavia to Corunna, Maine, Vancouver I.; 4-200 fms. It is much more com- |