iv 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. "V^Tiere 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 synon}Tnes, 

 and the errors unavoidably arising 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 wliich is devoted, for example, to the 

 species analysed in the Conchologia Iconica. 



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Mai-ch 1845, 



