188 Annals of the South African Museum. 



It is now by far the commonest shell in the Cape Peninsula, where 

 I believe it has caused the extinction of at least one native form, 

 Trachycysti* rariplicata Bs., for which I have often searched at Green 

 Point, its sole locality, without unearthing anything more interesting 

 than thousands of the European species. 



From Cape Town H. piscina has spread across the Flats to Somerset 

 West and Gordons Bay, and as far inland as Stellenbosch, while within 

 the last thirty years it has become extremely plentiful at Port Eliza- 

 beth and in the G-amtoos Valley. 



It was first noticed at Durban on sand-hills near the lighthouse in 

 August, 1905, by Dr. Longstaff, and at East London in November, 

 1915, by E. M. Lightfoot, who rightly points out that its presence in 

 the three last-mentioned localities is more likely to be due to separate 

 introductions than to spreading of the species. 



LEUCOCHILOIDES CALAHAKICUS (Bottger). 



Even if the above is identical with such as senegalensis Morelet, or 

 fallax Say, it can hardly be classed as an introduced species until the 

 original home of this world-diffused form is determined. South 

 African localities are: Jansenville ; Prieska ; Tauugs ; Hay District ; 

 G-hous ; Bullspoort ; near Schlip in Damaraland ; and the Victoria 

 Falls. 



ACHATINA AURORA Pfeiffer. 



There can be little doubt that the beach-rolled singleton which con- 

 stitutes this species was neither born in Durban nor ever entered that 

 port alive, but until it can be definitely identified with one of the 

 equatorial forms it is impossible to determine its true habitat. 



ACHATINA FULICA (Ferussac). 



It is rather remarkable that this common East Coast and Mauritian 

 species has not secured a wider footing in South Africa, the only known 

 instance of its incursion being a half-grown specimen, which was 

 captured in a Durban garden near some tins containing Crotons from 

 Mauritius, and presented alive to Mr. Burnup about 15 years ago. 



C^ECILIOIDES ACICULA (Muller). 



Widely diffused, though infrequent, throughout the continent, 

 apparently quite inseparable from the European form. I have found 



