Xli PREFACE. 



Among those who are willing to yield 

 submission to the judgment of Linnaeus, 

 whose experience in the scrutiny of Nature's 

 laws is, at least, not inferior to that of any 

 other man, — among those there are pro- 

 bably some, who have been prevented from 

 availing themselves of his method of 

 arrangement, by the want of an elementary 

 introduction, a key to the understanding of 

 his Catalogue of Shells, as translated by 

 Dr. Turton, and subsequently corrected 

 and elucidated by Mr. Dillwyn. 



It is with a view, in some degree, to sup- 

 ply this deficiency, and to engage a more 

 discriminating attention to the beautiful and 

 interesting collections of shells which are 

 so frequently found in the cabinets of those 

 who know not how to value them, as well as 



