T48 SOWERBY : MARINE SHELLS OF SOUTH AFRICA. 



Bullia digitalis Meusch. Upon comparing a considerable 

 number of specimens, varying not so much in form as in 

 colour and style of marking, I am convinced that Reeve's 

 B. sulcata^ B. semiflammea ^ and B. seiniusta are simply 

 varieties of this species. 



Nassa arcuiaria Ijnn. Very common in the Indian Ocean 

 and China Sea, but rarely found at the Cape. 



Purpura scobina Quoy. A small variable species, known 

 chiefly as inhabiting the shores of Australia, Tasmania and 

 New Zealand. The Cape variety identified- by the Rev. 

 A. H. Cooke is not so roughly ribbed, and approaches 

 rather more nearly to some of the torms of P. lapillus than 

 the prevailing Australian types. 



P. trigona Reeve. A single specimen in good condition was 

 sent me from Port Elizabeth by Mr. Bairstow. This, like 

 many of the shells of South Africa, is well-known as an 

 Australian species. 



P, livida Reeve. Mr. Ponsonby shewed me several specimens 

 from Port Elizabeth. 



Meiapium iineatum Lam. {=Bucciniim hdhus Wood). 

 Since the publication of my last paper Mr. Edgar A. Smith 

 has clearly shown that the small South African species, and 

 not the large one to which I referred, is the true Pyrida 

 lineata of Lamarck, the large species having been 

 described by Schubert and Wagner under the name of 

 Pyrula elata. Mr. Smith, in an interesting paper (Ann. & 

 Mag, of Nat. Hist, March, 1889), has described the animal 

 of this genus, which proves to -have no operculum. 



Tritonidia undosa var. minor. A small form not un- 

 common at the Cape. The species is common in Australian 

 waters, throughout the Indian Ocean and on the coast of 

 Mauritius. Of the specimens that have come under my 

 notice the smallest are found at the Cape, the Mauritian 

 are somewhat larger, and they increase in size further east- 

 ward, those from Singapore, Australia, and the Philippines 

 being the largest. 



J.C, vi., Oct., 1889. 



