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Show 118 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Feb. 19, R. costulata of Alder and probably also R. ovatella of Forbes are varieties of R. similis ; and there are several other synonyms. In my paper on Piedmontese Mollusca (nearly thirty years ago) I erroneously referred this species to R. oblong a of Desmarets ; I now consider that so-called species a variety of R. membranacea. R. costulata of Risso appears to be the same species as R. costata of Desmarets, which is R. variabilis of v. Miihlfeid. But it would cause unnecessary confusion if these names were interchanged. Let usage prevail. " I care not for their names." Specimens of R. costulata, Alder, from Cadiz, are undistinguishable from those of B. similis except in colour. The peculiar characters of both are the constriction of the body-whorl and mouth, and the spire tapering to a fine point. Some specimens of the typical form are rihless and nearly smooth, and others of the variety costulata are broader and more ventricose in the middle. 20. RISSOA VIOLACEA, Desmarets. R. violacea, Desm. in Bull, sc soc. phil. Paris, 1814, p. 8, pi. i. f. 7: B. C. iv. p. 33 ; v. p. 208, pi. lxvii. f. 9. 'Porcupine'Exp. 1870: Atl. St. Vigo B.; Med. Algeciras B., G. Tunis. Distribution. Loffoden Isles to the Mediterranean and Adriatic, Black Sea, Madeira, and Canaries ; 0-108 fms. Fossil. Pliocene : Italy. Post-tertiary : Norway, Scotland and Ireland, Nice, Leghorn, Ischia, Rhodes ; 0-100 ft. At least ten synonyms, including R. lilacina, Recluz, B. rufi-labrum, Leach apud Forbes and Hanley, Persephone rufilabris, Leach, and R. porifera, Loven. Variable as to size and the strength of sculpture, like all other littoral and prolific species. 21. RISSOA PARVA, Da Costa. Turbo parvus, Da Costa, Brit. Conch, p. 104. R. parva, B. C. iv. p. 23, pi. i. f. 1 ; v. p. 207, pi. lxvii. f. 3, 4. ' Porcupine' Exp. 1870 : Atl. St. Vigo B., 13, 36 (intermediate between the typical form and the variety interrupta), Gibraltar B. (monstr.). As var. interrupta, 1869 : Donegal B., L. Swilly. 1870: Atl. Vigo B. (semicostata), 16; Med. Algeciras B. (seiui-costata), 50, Adventure Bank. Distribution. Typical form and var. interrupta. Scandinavia from Vadso southwards, Great Britain and Ireland, Heligoland, Holland, France, Spain, Portugal, Italy, Dalmatia, Greece, Algeria, Madeira, Canary Isles, and ' Valorous ' and ' Travailleur' Expeditions ; 0- 1785 fms. (at great depths transported from the littoral and lami-narian zones). Fossil. Phocene or Post-tertiary : Scandinavia, Great Britain and Ireland, Biot, Nice, Italy, Cos, and Rhodes; 0-200 ft. Not as Turbo interrvptus of Adams from the Tertiary formation of N.W. Germany, described and figured by Philippi. |