VI INTRODUCTION. 
with accurate descriptions; the best or most 
easily accessible of which are given in the 
eunmeration 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 Part of the Cornish 
Fauna; and for 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. 
