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Show 30 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Jan. iO, species for N. pusilla of Sav, which has a calcareous operculum. I was at one time inclined to doubt whether N. pallida ot Broderip and Sowerby might not be N. islandica: but I have now satisfied myself, by the further examination of numerous specimens from the North Atlantic and Pacific oceans, that N. grcenlandica is sufficiently represented by their description although short, which is as follows:- "Natica pallida. N. testa subglobosa, albida, tenui, apice breviter acuminato, eroso ; anfractibus rotundatis, margine eleva-tiusculo, sutura distinct a ; umbilico parvo ; long. 1^0' *at- ^ P°"' Hab. in Oceano Arctico." From Icy Cape. Specimens from the arctic seas are much larger than those from the Dogger Bank. 3. NATICA MACILENTA, Philippi. N. macilenta, Phil. Moll. Sic. ii. p. 140, t. xxiv. f. 14. ' Porcupine' Exp. 1870: Med. St. Algesiras B., Capo de Gata, 50, 55, G. Bona, Benzert Road, Rasel Amoush, G. Tunis, Adventure Bank (and var. alba). Distribution. Throughout the Mediterranean and AJriatic, M o - gador (McAndrew)! Fossil. Pliocene : Biot, Italy, and Rhodes. Probably N. pulchella of Risso ; but his descriptions are very insufficient to identify any species. The present species comes near N. guillemini of Payraudeau, and may be a variety of it: the latter differs only in its less oval shape and being of a larger size. N. rizza of Philippi appears to be a variety of his N. macilenta. If all these species are the same Payraudeau's name has priority over both of Philippi's species, although it is posterior to that of Risso. 4. NATICA GLAUCINA, Linne. N. glaucina, L. Fauna Suecica, ed. 2, p. 533, no. 2197. N. alderi, B. C. iv. p. 224 ; v. p. 215, pi. lxxviii. f. 5. 'Porcupine' Exp. 1869: St. 1, 2,3, 12, 14, 17, 18, 23a (and var. lactea), L. Swilly, L. Fovle, 33, 35, off Lerwick. 1870: Atl. Vigo B., Tangier B.; Med. Algesiras B., Benzert Road. Distribution. Loffoden I. to the Mediterranean and Adriatic: 2-310 fms. Fossil. Pliocene : Red Crag, Tuscany, Calabria. Post-tertiary ; Scandinavia, British Isles, and Messina. As a mere act of justice to the illustrious Swede, I feel myself compelled to substitute for alderi the specific name glaucina, by which he originally and undoubtedly designated and so fully described this common European shell in his ' Fauna Suecica,' and which he afterwards countersigned or sufficiently indicated in the twelfth edition of the ' Systema Naturae.' When I was tempted to adopt the name given by Professor Forbes in honour of Mr. Alder (both of them my old and lost friends !), I was misled by the long and perplexing discussion of the Linnean species in Mr. Hanley's |