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, e.g. 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 endemic. 

 They cannot be considered members of the S. Helena fauna. 



The trend of the Atlantic currents should make us very chary of 

 admitting 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 contains 

 altogether 34 species known to inhabit European waters." It is not 

 quite easy to determine which are the 34 species, but probably the 

 following (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, P.Z.S., iSgo, J>. 2.ff. 



