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Show 1884.] ' L I G H T N I N G ' A N D ' P O R C U P I N E ' EXPEDITIONS. 125 34. RISSOA TENUISCULPTA (Jeffreys), Watson. R. tenuisculpta, Wats, in Proc. Zool. Soc. 1873, p. 369, pi. xxxvi. t. 28. 'Porcupine' Exp. 1870: Atl. St. 9, 16, 17a, 26, 36; Med. 53, Adventure Bank. One of the specimens has the middle whorl keeled or angular. Distribution. Bay of Biscay (de Folin and ' Travailleur' Exp.), Mediterranean (Italian Exp.), Madeira (McAndrew and Watson), off Culebra I. and Ascension (' Challenger ' Exp.) ; 25-640 fms. The sculpture is more or less strong, and the size of the last whorl and of the mouth is variable. In my deep-sea specimens the longitudinal striae are distinct, numerous, and curved (flexuous on the last whorl), but they do not extend below the periphery. Mr. Watson says, "Longitudinal lines of growth few, faint, hair-like." From a careful comparison of many specimens with those of Rissoa 1 coriacea, Manzoni (Journal de Conchyliologie, 1868, pp. 166 and 242, pi. x. f. 6), I should be inclined to unite the two Madeiran species. In such case the latter specific name would have precedence. 35. RISSOA PROXIMA, Alder. R. proxima (Alder), Forbes & Hanley, iii. p. 127, pi. lxxv. f. 7, 8 : B. C. iv. p. 39 ; v. p. 208, pi. lxviii. f. 3. 'Porcupine' Exp. 1869: St. 2, 18. 1870: Atl. 10. Distribution. Loffoden Isles to the Mediterranean ; 15-108 fms. Fossil. Pliocene : Coralline Crag, Siena and Palermo. This species was first and fully described by me in the ' Annals and Magazine of Natural History ' for 1848 (p. 16), under the name of R. striatula, and that specific name has the priority of many years over the late Mr. Alder's name of proxima. But in order to prevent my name being confounded with that of Turbo striatulus, Linne (which, however, is a species of Odostomia), I afterwards relinquished my name and adopted that of Alder, by which the species is now generally known to conchologists. Perhaps I was not in strictness justified in doing so. 36. RISSOA VITREA, Montagu. Turbo vitreus, Mont. Test. Brit. p. 321, t. 12. f. 3. R. vitreu, B. C. iv. p. 40 ; v. p. 208, pi. lviii. f. 4. 'Porcupine' Exp. 1869 : St. 2, 18. 1870 : Atl. 10, Vigo B., 29, 30 ; Med. 50, Benzert Road. Distribution. Bohuslan (Malm) to the Mediterranean ; 12-249 fms. Fossil. Miocene: Transylvania (Hauer and Stache)1 Pliocene: Coralline Crag and Italy. Post-tertiary : Sweden, Belfast, and Leghorn. Not R. vitrea of Nyst or of M . Sars. See B. C. iv. p. 40, as to the characters which distinguish this species from R. proxima. |
