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Show 56 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Jail. 20, Bittium1, Leach. Basal notch shallow and not recurved; apex regular. 7. C E R I T H I U M L A C T E U M , Philippi. C. lacteum, Phil. Moll. Sic. i. p. 195. C. alyerianum, Sowerby, Thes. Conch, p. 129, f. 230, 231. ' Porcupine' Exp. 1870 : Atl. St. Tangier B. ; Med. 50, Benzert Road, Rasel Amoush. Distribution. Cap Breton (De Folin)\, Mediterranean and Adriatic, Madeira (Watson) ! ; 29-108 fms. Fossil. Pliocene : Calabria and Sicily (Philippi and Seguenza), Madeira (Mayer). Post-tertiary : Sicily (Aradas and Bruynone). Judging from the description and figure given by De Blainville of his C. elegans in the ' Faune Franchise,' I cannot agree with Weinkauff in regarding it as the present species. 8. CERITHIUM WATSONI, Jeffreys. (Plate VI. figs. 6, 6 a.) C. gemmatum, Watson in Journ. Linn. Soc. (Zool.), vol. xv. p. 113(1880). 'Porcupine' Exp. 1870: Atl. Vigo B., 13, 16, 17a, Setubal B., 24, 26-34, 36. Abundant. Distribution. N. Spain ('Travailleur' Exp.), Setubal B. ('Challenger' Exp.), Josephine Bank ('Josephine' Exp.), off Marocco ('Talisman' Exp.) ; 217-1029 fms. The animal is yellowish-white, with a faint tinge of brown in front: snout small: tentacles cylindrical, short: eyes seated on bulbous offsets of the tentacles, about one third from their bases : foot thick : operculum yellowish, circular, and paucispiral, with imbricated edges. Sculpture variable, the longitudinal ribs sometimes disappearing on the last and next whorl, although the spiral ribs seem to be always present. Apex as in G. lacteum. Not C. gemmatum of Hinds, 1844, the type of Fertagus of Klein, or Rhinoclavis of Swainson, which is a subgenus of Cerithium according to Dr. Paul Fischer. I have therefore given the present species the name of m y friend the Rev. Robert Boog Watson, who has so admirably worked out the new species of Univalves from the ' Challenger ' Expedition. 9. CERITHIUM RETICULATUM, Da Costa. Strombiformis reticulatus, Da C. Brit. Conch. (1778) p. pi. viii. f. 13. C. reticulatum, B.C. iv. p. 258, pi. iv. f. 4 ; v. p. 217, pi. lxxx. f. 4. 'Porcupine' Exp. 18G9 : St. Donegal B. (large specimens), 33. 1870: Atl. Vigo B., 26, 30 ; Med. Algesiras B., 55, Benzert Road, G. Tunis, Adventure Bank. 1 This name appears for the first time in Gray's 'List of Genera,' on the or supposed authority of Dr. Leach. It does not occur in Scudders ' Nomenclator Zoologicus,' 1882. |