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Show 586 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [J wegian arctic Exp. 1878, 'Challenger' Exp. (off Fayal); 70-790 fms. Var. angusta, ' Challenger' Exp. (off Tenenffe) ; 70 fms. Fossil. Miocene and Pliocene. Cassel, Mayence Basin, Italy. Recent: L. borealis, Woodward, L. abyssicola, A. Adams, and the very young L. tenuis, Seguenza. Fossil: Pectunculus aradasii, Testa, P. grossi, Aradas, and L. incequidens, Sandberger. 1. MALLETIA OBTUSA, M. Sars. Yoldia abyssicola, M . Sars in Christ. Vid. Selsk. Forh. (1858), p. 86. Y. obtusa (M. Sars), G. O. Sars ' O n some remarkable Forms of animal Life from the great Deeps off the Norwegian Coast' (1872), p. 23, pi. 3. f. 16-20. 'Porcupine' Exp. 1869 : St. 19, 22,28, 30. 1870: Atl. 9, off C. Espichel. The body is clear-white and gelatinous, and the upper tube is very long and cylindrical. Distribution. Loffoden Isles to the Bergen coast, Norwegian arctic Exp. 1876 (between Norway and Iceland) ; 200-650 fms. The M S . name abyssicola, originally given by the late eminent Professor Sars to this remarkable shell, was afterwards changed by him to obtusa in consequence of Torell having described and figured another shell which Sars regarded as also belonging to Yoldia, under the same name abyssicola. The present species is not the Yoldia obtusa of Gould (1846), from Hong-Kong harbour ; but that shell belongs to the genus Leda ; and at all events it is better to avoid further confusion by appropriating the name obtusa to the North- Atlantic shell. For the reasons which I gave in 'British Conchology' (ii. 153), I cannot recognize the genus Yoldia. The late Dr. Morch placed this species in the genus Malletia of Desmoulins, from an examination of m y specimens. A tribute of respect to his memory is justly due from all conchologists for his bibliographical research, and other valuable labours. 2. MALLETIA CUNEATA, Jeffreys. (Plate XLVI. fig. 10.) M. cuneata, Jeffr. in Ann. & Mag. N . H. Nov. 1876, p. 435. ' Porcupine' Exp. 1869 : St. 19, 20, 28. 1870 *. Atl. 16,17,17a, off C. Espichel, 22 ; Med. 51. Distribution. 'Valorous' Exp., Norwegian arctic Exp. 1876; 1333-1760 fms. 3. MALLETIA EXCISA, Philippi. Nucula excisa, Ph. Moll. Sic. ii. p. 46, t. xv. f. 4. M. excisa, Jeffr. in Ann. & Mag. N . H . Nov. 1876, p. 435. 'Porcupine' Exp. 1869: St. 20, 21, 28. Distribution. ' Valorous ' Exp., ' Challenger' Exp. ( W . of Azores and Canaries) ; 1125-1785 fms. Fossil. Pliocene. Biot, Calabria, and Sicily. It will be seen that the last species, as well as many other deep-water shells which have been noticed in the present paper, are Cala-brian and Sicilian Tertiary fossils. Besides these species, others of the |