Notes on South African Non-marine Mollusca. 189 



it in gardens at Wynberg, where it was very probably introduced direct 

 in soil from England, and in the Bushveldt in the Northern Transvaal, 

 where it is most unlikely to have been deposited by human agency. 

 Other recorded localities ai-e Bloemfonteiu, Prieska, Cradock and 

 Kimberley, to which may now be added Grahamstown (Kiucaid and 

 Farquhar) and Macequece District, Portuguese East Africa. 



I have little doubt that G. advena Aucey, from Disappointment Vlei, 

 Ovampoland, and C. ovampoensis M. & P., described from Ovampolaud 

 and recorded by Sturany from Matolla, near Delagoa Bay, are synony- 

 mous with C. acicula, but no authentic example of advena can be 

 traced, while the Type-set of ovampoensis is now in hardly sufficiently 

 good condition to admit of accurate comparison. 



SUBULINA OCTONA (Bruguiere). 



A shell attributed to this circum-tropical species is common at the 

 Victoria Falls. As it is recorded by Pilsbry from both the East and 

 West Coasts of Africa its occurrence in the centre is not unnatural. 

 Pilsbry remarks : " It is generally and I believe correctly held that this 

 species in the tropics of the Old World is an emigrant from America. 

 It appears first to get foothold in centres of trade and agriculture and 

 to spread with extraordinary rapidity into neighbouring districts" 

 (Man. of Conch, xviii, p. 74). 



RUMINA DECOLLATA (Lilllle). 



As mentioned in my Reference List, there is no evidence that the 

 two examples of this species which were found at Port Elizabeth in 

 1897 were imported in other than dead condition. They have recently 

 been secured for the collection of the South African Museum. 



LIMN.EA TRUNCATULA (Miiller). 



The species named by Kiister L. umlaasianus and placed in the 

 above synonymy by Bourguignat is by no means common in South 

 Africa, being only recorded from the Umlaas River, Natal ; Fountains, 

 Pretoria, and Stellenbosch. 



PLANOEBIS GIBBONSI Nelson. 



As this species was described from Zanzibar its occurrence in the 

 Black River, Maitland, where it was first found in 1910, might appear 

 to be due to human aid, but as it has since turned up in the Congo 



