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Show 100 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Mar. 6, having a broad and flattened base, which he considered the present species. Fossil. Pliocene: Leghorn (Appelius). Post-tertiary : Cumbrae (Robertson), Selsea (A. Bell). Trochus crassus of Pulteney, whose T. lineatus is the young ; a variety is Monodonta articulata, Lamarck, M. draparnaudi, Payraudeau, M. punctulata, de Blainville (not of Lamarck), M. sitis, Recluz (young), and Turbo corcyrensis, Stossich (young). Not Trochus lineatus of Lamarck, which is a Senegalese species. The young are umbilicate, as in the last and other species of this genus. 13. TROCHUS TURBINATUS, Born. T. turbinatus, Born. Mus. Caes. Vind. Test. 1778, p. 340; id. 1780, t. 12. f. 5, 6. ' Porcupine' Exp. 1870 : Med. St. Algesiras B. Bistribution. Charente-Inferieure (Beltremieux), throughout the Mediterranean and Adriatic, Canaries (Lister and d'Orbigny); 0-2 fms. Fossil. Pliocene : Italy. Post-tertiary : S. France. This species, which is so peculiar to the Mediterranean and Adriatic, is also T. tessulatus of Born, T. tessellatus of Gmelin, Monodonta fragaroides of Lamarck, M. olivieri of Payraudeau, and T. fragarioides of Philippi, a variety being his T. mutabilis. Perhaps T. lineatus may be the same species. The publications jf Da Costa and Born were contemporaneous. Both species, if distinct, are variable; and there appear to be intermediate gradations. D. GIBBULA, Risso. 14. TROCHUS MAGUS, Linne. T. magus, L. S. N. p. 1228: B. C. iii. p. 305 ; v. p. 203, pi. lxii. f 1. 'Porcupine' Exp. 1870: Med. Capo di Gaeta, Benzert Road, Adventure Bank. Bistribution. S.W. Sweden and Shetland to Mogador, Mediterranean, Adriatic, Canaries ; 0-40 fms. Fossil. Pliocene : Italy, Rhodes, Cos, C. Verde I. Post-tertiary : Norway, British Isles, and Tuscany ; 0-1360 ft. . 15. TROCHUS RICHARDI, (richardii) Payraudeau. T. richardii, Payr. Moll. Corse (1826), p. 138, t. vii. f. 1, 2. « Porcupine ' Exp. 1870 : Atl. St. Gibraltar B. Distribution. Coast of Portugal and Gibraltar (McAndrew), Mediterranean and Adriatic, Canaries (d' Orbigny) ; 0-13| fms. Fossil. Pliocene : Italy. Post-tertiary : S. France and Leghorn. Turbo variegatus (1813) and Phorcus margaritaceus (1826), Risso ; Trochus cinerarius, Costa, not Linne. |