THE OPISTHOBRANCHIATA 



OP 



SOUTH AFEICA. 



BY 



R. BERG-H, Copenhagen. 



(With Foueteen Plates.) 



The number of Opisthobraiichiata hitherto known from the coast 

 of South Africa is very small. Krause described a Pleurohraiichus 

 granulatus, Vayssi^re a PleurohranchcBa capensis, Eang a Melibe 

 rosea, Stimpson a Tritonia pallida and a Triopa hicida. 



The investigations of late years of the Cape Government, carried 

 out under the direction of Dr. Gilchrist, have considerably aug- 

 mented the number, and have furnished the material for the 

 following report. 



The East and South Coasts of South Africa are washed by a 

 prolongation of the great equatorial current from the Indian Ocean ; 

 the West, on the contrary, by the cold Antarctic current. Some- 

 times, however, it happens that the warm Agulhas current passes up 

 this side, while at other times the cold Antarctic current passes 

 further to the East." In general there is a marked difference 



* Gilchrist, " Observations on the Temperature and Salinity of the Sea around 

 the Cape Peninsula." Mar. Inv. I., 1902, pp. 181-216. 



Gilchrist, " Currents on the South African Coast, as Indicated by the Course of 

 Drift Bottles," part ii. 1904, pp. 155-16G. 



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