IV PREFACE. 



It is to be hoped that an inspection of the Plates, and a 

 careful comparative examination of the Figures, will leave 

 the Subscribers at least as well satisfied with the second 

 part of the Index, as they have kindly professed themselves 

 to be with the first. 



The additional list of Lamarckian names, adapted to the 

 plates and figures in the Index Testaceologicus, has been 

 extracted from the three last volumes of the " Animaux sans 

 Fertdbres"; and the Genera have been arranged alphabeti- 

 cally for the convenience of reference. 



As a guide to the comparative size of the different shells, 

 a mark or a letter of the alphabet is added after the number 

 engraved on the plate. Thus + indicates a shell half an inch 

 long ; + three-quarters of an inch ; a an inch ; a an inch and 

 a quarter; a + an inch and a half; a + an inch and three- 

 quarters ; b two inches ; c three inches, and so on : n denotes 

 shells of the natural size; and m such as are magnified. 



London, 

 May, 17, 1828. 



