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PREFACE. 



The object of this Nomenclature is to present a Catalogue 

 of the well-established Species of Mollusca, with references 

 to where they are described and figured, and to the most 

 important synonyma ; to give a List of the Specimens con- 

 tained in the Museum collection, with an indication of their 

 habitat and origin ; and to point out the Desiderata of that 

 collection at the period of publication. 



The list must only be considered as prefatory to a more 

 comprehensive Catalogue. 



JOHN EDWARD GRAY. 



British Museum, 

 March, 1850. 



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