VI INTRODUCTION. 



with accurate descriptions; the best or most 

 easilv accessible of which are aiven in the 

 enumeration of each separate species, but of 

 which those of Montagu are most earnesly re- 

 commended to the student. To the names 

 of all the shells of which specimens are pre- 

 served in the Museum of the Royal Institution, 

 a star is affixed, as in the first Fart of the Cornish 

 Fauna ; and £pr the remainder the individual 

 authority is given : in doing which it has been 

 judged more proper to suffer the omission of 

 some species of which there might be little 

 doubt, rather than to insert any on insufficient 

 authority. But notwithstanding the efforts which 

 the Author has made to obtain specimens in 

 their native abodes, and the kind assistance of 

 some friends, whose names are partly acknow- 

 ledged when speaking of the shells for which 

 the acknowledgement is due, still to render the 

 Fauna in this Department complete will require 

 the contribution of several hands ; for in the 

 course of his researches the Author has found, 

 that a small extent of coast will sometimes 

 present a change of species ; and some which 

 are rare in one district, shall occur in abundance 

 in another. 



