PREFACE. 



vii 



the name of the naturalist who introduced it, 

 in order that it may be distinguished from 

 those mentioned by Lamarck himself. To 

 avoid confusion, however, no great change has 

 been made in the systematic arrangement. 



The author wishes, in this place, to acknow- 

 ledge the kind assistance, and valuable inform- 

 ation, she has received from a gentleman well 

 versed in the science, but to whom she is per- 

 sonally unknown ; and to express her thanks 

 to a kind friend for some of the drawings by 

 which these pages are illustrated. She would 

 be ungrateful, were she not also to acknowledge 

 the instruction she has received from her friend 

 Mr. Swainson, whose works on Natural History 

 are so well known to the public, and who first 

 turned her thoughts to the study of Con- 

 chology, which she trusts her humble efforts 

 will have rendered interesting to those for 

 whose information this volume was written. 



A 4 



