limited means, it is published at the cost of paper and 

 printing. 



The three volumes of plates now published emii- 

 plete the series of Gasteropodous and Pteropodous Mol- 

 lusca. They form, I believe, the largest cumber of 

 figures of the species of these animals that has hitherto 

 been brought together in one work. 



The explanations of the plates have been formed into 



parate volume, for the purpose of more easy con- 

 sultation ; and to carry out this view, the references to 

 the plates forming the first volume of the series have been 

 reprinted. To this part of the work has been added a 

 systematic distribution of the species figured, with the 

 characters of the orders, families, and their subdivisions, 

 and a list of the genera of Mollusca and their syno- 

 nvma, originally printed in the Proceedings of the Zoolo- 

 gical Society for 1847. 



The series of plates containing the Conchifeious 

 Mollusca is in hand, and will be published at a future 

 period. 



JOHN EDWARD GRAY. 



British Museum, 

 February 12, 1850. 



