Vlll 



The whole of my collections in British Con- 

 chology are now in your possession : and in the 

 ensuing catalogue, nothing has been introduced 

 of which perfect specimens cannot be found in 

 that collection. Consequently I could not fully 

 avail myself of the scientific papers of Mr. 

 Jeffries in the Linnean Transactions; of Mr. 

 Alder, in the Transactions of the Newcastle 

 Society ; nor of some local catalogues. Such 

 as I believe to have been introduced, as British, 

 upon doubtful authority, have this mark (f ) 

 prefixed to them. The Genus AURICULA has 

 been exploded, as being either altogether marine ; 

 or which, tike the TURBO tenebrosus, and some 

 others, having unquestioned communication with 

 salt water, are never found in inland and trans- 

 marine localities. 



Your sincere Friend, 



WILLIAM TVRTON. 



Bideford, Devon, 1831. 



