Journal of conchology . f of Guinea is dueto a counter current, which runs eastward in the neighbourhood ofthe equator, between the cyclonic systems of the North and SouthAtlantic. At a certain time of year when the sun is well south of theline the whole systciUi shifts further south, and the Benguela Currentthen impinges on S. Helena, which for the greater part of the year is iS6 JOURNAL OF CONCHOLOGY, VOL. l6, NO. 8, JANUARY, I922. in the central still area. This accounts for the occurrence of certain^ Cape shells on the island, Mitra simplex Dkr., Miirex pur-pur aides Dkr., Columbella
Journal of conchology . f of Guinea is dueto a counter current, which runs eastward in the neighbourhood ofthe equator, between the cyclonic systems of the North and SouthAtlantic. At a certain time of year when the sun is well south of theline the whole systciUi shifts further south, and the Benguela Currentthen impinges on S. Helena, which for the greater part of the year is iS6 JOURNAL OF CONCHOLOGY, VOL. l6, NO. 8, JANUARY, I922. in the central still area. This accounts for the occurrence of certain^ Cape shells on the island, Mitra simplex Dkr., Miirex pur-pur aides Dkr., Columbella kraussii Sow. and Gadinia costata Krs.,which have drifted on weed from the Cape where they are cannot be considered members of the S. Helena fauna. The trend of the Atlantic currents should make us very chary ofadmitting palsearctic species to the S. African list. Now in \hQjourn,of Conch, vi, p. 147 Sowerby wrote :— One thing struck me as re-markable and that is the number of British and European species. found on the South African coast, and again the list containsaltogether 34 species known to inhabit European waters. It is notquite easy to determine which are the 34 species, but probably thefollowing (names as given by Sowerby) :—Argonauta argo L. * Pseudomurex meyendorffi Calc. = Coralliophila fritschi Mts. ^ Triton cutaceus L. = Cymatium africanum A. Ad. Triton nodiferus Lam. * Triforis perversa L. = Triphora africana Bartsch. I Smith, Mar. Moll. S. Helena, , iSgo, J>. TOXrLIN : REMARKS ON CAPE MARINE PROVINCE. = 6. wilmancs Tonilin. 257 *Siliquaria anguina L. Ovulu7n spelta L. Ovulum carfieum Poiret.^Turbo safiguineus L. Cerithium vnlgatum Brug.*Cent/imfii coutractum Sow. Trochita chinensis L.^Fissurella neglecta Dh. Phi line a pert a L. Cxlichna 7imbiUcata Mont. Aplysia punctata Cuv.^Chito7i marginatus Penn. * Tel Una cakm-ea cumana Hanley. Psainmobja vespertina Gm. Venus ven-ucosa L. var. capensis*Arca lactea L.*Luci7ia lactea
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Keywords: ., bookauthorconcholo, bookcentury1800, bookdecade1870, bookyear1879
