182 Annals of the South African Museum. 



Onchidium, owing to the uncertainty as to their correct identification 

 and the difficulty of determining their original home. 



TESTACELLA MAUGEI Ferussac ( T. aurigaster Layard in MS.). 



Taylor * holds that aurigaster Layard is synonymous with maugei, 

 and as his views have recently been confirmed by H. Watson f there 

 is no ground for the retention of the former name, a desirable result, 

 since no description or figure of aurigaster can be traced and the 

 name is really nude. 



T. maugei is restricted to Cape Town, and is now becoming fairly 

 frequent in other gardens than those of the South African Museum, 

 in which it was first noticed by Layard. It is peculiarly spasmodic 

 in its appearance, being moderately abundant one season and then 

 allowing several years to elapse before again attracting attention. 

 Its introduction to its South African habitat is easily accountable. 



VlTREA CRYSTALLINA (Miiller). 



Only known so far from a few gardens in the neighbourhood of 

 Cape Town and Wynberg, where it has been found locally abundant 

 by E. M. Lightfoot, who first noticed the species in 1890 ; it has 

 doubtless been imported in soil. 



POLITA ALLIARIA (Miller). 



Frequent in gardens at Grahamstown, where Mr. Farquhar tells 

 me that he found it in decayed leaves under bushes, fifty yards from 

 his house, when he first went there about 1894. 



Its introduction probably dates to a considerably earlier period, for 

 the G-rahamstowii shells are so much more highly sculptured than 

 typical alliaria that they might have been considered a distinct 

 species, were it not that the Rev. E. Wake Bowell has pronounced 

 their anatomy to be identical with that of the European form. 



The ordinary smooth variety has existed for at least six years in the 

 greenhouses round the South African Museum, Cape Town. 



POLITA CELLARIA (Miiller). 



Considering that it was noticed by Benson at Roudebosch, where 

 it is now abundant in the woods of Groot Schuur, as long ago as 

 1846, and was also recorded by Gibbons from the Cape in 1878, it is 



* Mon. Brit. Moll. 1902, pp. 25, 27. 

 t Ann. Natal Mus. 1915, iii, p. 220. 



