1V PREFACE. 
being followed by. that of the author, and the author’s name by 
references to description and figure ; and the synonymes are added 
at discretion. Where there is not sufficient space in the line to 
insert both the description and figure references, a preference is 
given to’ the latter, as being the better means of identification. 
As this is the first attempt that has been made towards the 
compilation of a Conchological Catalogue of Species, great allow- 
ance must be made for inaccurate applications of synonymes, 
and the errors unavoidably arisg from noting the same species 
in different genera, or in the same genus under different names. 
The best judgment has been exercised in the arbitration of the 
species ; but the authors cannot feel themselves responsible for their 
value, it having been impossible to treat them with that particu- 
lar investigation and study which is devoted, for example, to the 
species analysed in the ConcnoLoera Icontca. 
8, King Willliam Street, Strand. A.C. and L. R. 
March 1845. 
