Just Published, in Imperial 8vo. price, Coloured, £1 5s. 

 Plain, 16*. 



put I 



OF THE 



THESAURUS CONCHYLIORUM, 



BY 



G. B. SOWERBY, Jun. 



Containing descriptions of all the species hitherto known of 

 the following Genera of Shells ; Helicina, Pupina, Rostellaria, 

 Aporrhais, Struthiolaria and Strombus, accompanied by 

 300 highly finished coloured engravings. 



This work is commenced, and will be continued on a 

 more extensive, complete, and economic plan than has 

 hitherto been attempted. It is intended to be so complete 

 as to supersede the necessity of keeping an extensive con- 

 chological library, or of consulting a variety of books for 

 the purpose of identifying species. It will form a com- 

 plete CONCHOLOGICAL ' LlBRARY IN ITSELF. 



The vast increase in the number of species, either unde- 

 scribed or published in miscellaneous works, and voyages ; 

 the difficulty of obtaining such works, or of naming species 

 without them, and the confusion of Synonymes which has 

 been the result, are facts which prove the importance of the 

 present undertaking. The facilities enjoyed by the author, 

 in having access to several of the most important collections; 

 and obtaining the fullest information respecting the localities 

 of subjects by those who have sought them in their native 

 abodes, will, it is trusted, enable him to supply a generally 

 acknowledged desideratum. He hopes to do this in such a 

 manner as to fulfil the expectations of his friends, who may 



