INTRODUCTION 



The object of this work is to furnish a list of all the various 

 names under which, at one time or another, the several species 

 of the British Non-marine MoUusca, Recent and Post-Tertiary, 

 have been known. The term " name " is here used to designate 

 the combination of the generic (with sometimes the subgeneric, 

 but not sectional) and specific names. 



The work also serves as an Index, so far as the included species 

 are concerned, to all the more important manuals dealing with 

 the British MoUusca, as well as such of the older foreign ones 

 that have a direct bearing on the subject matter, a list of which 

 is appended (p. ix). In all other cases the first occurrence only 

 of a given name is recorded. Important synonyms have been 

 added from all available sources, but no attempt has been made, 

 nor could any such be successful, to include all the innumerable 

 names founded, chiefly by continental writers, on forms which 

 are of mere varietal value, if that. Names of doubtful identity, 

 preceded by a " ?," have been introduced when they have been 

 cited as correct by subsequent writers. Similarly varietal names 

 elevated into specific by some later author have been included. 

 An " * " is prefixed to those, fortunately few, entries of which 

 it has not been possible to see the original, and supplied informa- 

 tion is enclosed in " [ ]". A " -j- " is prefixed to the names of 

 extinct species. 



Citations of papers that have appeared in serial publications 

 or as parts of larger works, are made direct to the serial or work 

 in question, the titles of the papers or contributions themselves 

 being given in the appended " Bibliography." Every care has 

 been taken to make all the references correct, but it is too much 

 to expect that no errors have crept in, and kind indulgence is 

 craved for any such. 



Inevitably, of course, some of the synonyms are to a certain 



