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Show 1884.] 'LIGHTNING'AND ' PORCUPINE' EXPEDITIONS. 117 Distribution. Lisbon (McAndrew), Mediterranean and Adriatic 4-18 fms. Fossil. Pliocene : Central and Southern Italy. Post-tertiary: Rhodes and Cyprus. In the shape and columellar fold this species is allied to the next. 17. RISSOA MEMBRANACEA, Adams. Turbo membranaceus, Ad. in Tr. Linn. Soc. v. p. 2, t. i. f. 12, 13. B. membranacea, B. C. iv. p. 30; v. p. 208, pi. lxvii. f. 8. 'Porcupine' Exp. 1869 : St. Donegal B. 1870 : Atl. 26. Distribution. Throughout tbe European seas from the Loffoden Isles southwards, Black Sea, the African coasts of the Mediterranean, and Canaries (Schwartz) ; 0-600 fms. Fossil. Pliocene: Italy. Post-tertiary: Scandinavia, Scotland, Ireland, Selsea, Martigues, Rhodes; 0-100 ft. The varieties and names of so-called species which I consider varieties are very numerous; I have noted more than a score of such synonyms. B. splendida of Eichwald appears to differ only in having a shorter spire and rows of small purplish spots, arranged in the same way as in a pretty Algerian variety of B. montacuti. 18. RISSOA VARIABILIS, Megerle v. Miihlfeld. Turbo variabilis, Meg. v. Miihlf. Ges. Nat. fr. zu Berlin, 1829, i. p. 212, t. i. (7), f. 9, a, b. 'Porcupine' Exp. 1870: Med. St. Algeciras B. Distribution. Atlantic coasts of Spain and Portugal, Mediterranean, Adriatic, and Black Sea; 10-120 fms. Fossil. Miocene : Madeira (Mayer). Pliocene : Italy. Post-tertiary : Nice, Leghorn, Sicily, Rhodes. B. costata of Desmarets and B. desmaresti of Forbes. Monterosato says (in his letter) that perhaps Eulima cingulata of Requien may have been an elongated ribless variety of the present species. Such attempts at identifying doubtful species of obscure authors are more ingenious than useful. B. variabilis deserves its name, as regards the length of spire and strength of sculpture. 19. RISSOA SIMILIS, Scacchi. B. similis, Sc. Cat. conch. Neap. 1836, p. 15 ; Phil. Moll. Sic. ii. p. 124, t. xxiii. f. 5. Var. as R. costulata, B. C. iv. p. 35 ; v. p. 208, pi. lviii. f. 1. ' Porcupine ' Exp. 1870: Atl. St. Vigo B. Distribution. From Scarborough and along the western coasts of France and Spain to the Mediterranean and Adriatic, Madeira and the Canaries; 0-150 fms. Fossil. Miocene : Madeira. Pliocene : Italy. Post-tertiary : Selsea, Leghorn, Ischia, Rhodes, and Cyprus. |