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Show 656 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Nov. 14, three Foxes would keep near the edge of a hole of water and Looms; they would then carry them up a few hundred yards on the land, where they were relieved by other Foxes, who carried them up some distance, and then deposited them, for others to carry them to some place in the cliff; but we could never manage to find out their storehouse. 7. On the Mollusca procured during the ' Lightning ' and ' Porcupine' Expeditions, 1868-70. (Part V.1) By J. G W Y N JEFFREYS, LL.D., F.R.S., F.Z.S. [Received November 1, 1882.] (Plates XLIX., L) Since the publication of the last part of this memoir I have, through the kindness of several eminent palaeontologists in Italy, had an opportunity of examining their rich collections of Subapennine and Sicilian Tertiary shells, and of carefully comparing them with their living analogues. This kind of study is indispensable to all zoologists in every department; and it teaches us at least two important facts, viz., 1st, the exact concordance in the most minute particulars of so many species in their fossil and recent state, notwithstanding the lapse of the enormous and incalculable time which has intervened ; and 2nd, the extensive changes which have taken place during the same period between the depth of the ocean and the height of land in the North-Atlantic area. The latter fact has been demonstrated in a short paper which I contributed to the Geological Society in 1880, " On the Occurrence of Marine Shells of existing Species at different heights above the present Level of the Sea," and which has reference to the present work. The Expedition made this summer in the French vessel ' Le Travailleur' for exploring the depths of the Lusitanian seas for a third time, as well as of the seas lying between Cadiz, the Canaries, Madeira, and the Azores, has been most successful and productive ; and I have been indebted to the obliging favour of my friend Dr. Paul Fischer, for the opportunity of examining the interesting Mollusca which were thus procured. The complete investigation of the Mollusca in even this comparatively limited area must be inexhaustible. What shall we say then to the investigation of all the various and hitherto unknown fauna which inhabit the depths of every ocean throughout the whole world ! I will now continue my account of the Mollusca from the ' Lightning ' and ' Porcupine' Expeditions. Class SOLENOCONCHIA. Family DENTALIID.<E. 1. D E N T A L I U M DENTALIS, Linne-. D. dentalis, L. S. N. p. 1263; G. B. Sowerby, Thes. Conch. pl. ccxxiv. f. 24, 27. 1 For Part I. see P. Z. S. 1878, p. 393; for Part II. see P. Z. S. 1879 p 553 • for Part III. see P. Z. S. 1881, p. 693; and for Part IV. see P. Z. S. 1881, p. 922* |