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ADDRESS. 



ON the 5th of July last I had the honour of laying before the 

 Academy of Sciences at Paris, the outline of a classification 

 which I propose to offer for the arrangement of the Lepades 

 and Conchiferous Mollusca ; and I now submit my " Con- 

 chologia Systematica" to the attention of naturalists, in 

 the hope that it may, at least, contribute something to our 

 imperfect knowledge of these remarkable animals. 



It is not my intention to add to the controversy on the true 

 definition of this science, nor to acknowledge any distinction 

 between the study of Malacology and that of Conchology ; I 

 conceive the natural history of the animal to be inseparable 

 from that of the shell, and have adopted the latter term as the 

 original and most suitable. 



My object in the foregoing arrangement has been to carry out 

 as closely as possible the general views and intentions of that 

 great conchologist Lamarck ; his genera have been for the 

 most part adopted, and only such alterations and additions 

 have been made in the nomenclature and relative distribution 

 of these animals, as the progress of science has rendered neces- 

 sary ; in all cases, however, this has been done with caution. 



It is pleasing to me to acknowledge that I have profited 

 considerably by the labours of Cuvier, De Blainville, Deshayes, 



