PREFACE. XI 



nera, as suggested by certain modern con- 

 chologists. 



Considerable alterations have likewise 

 been made in the descriptions at the head 

 of each genus, which, being founded on 

 a minute examination, and comparison, of 

 species, it is hoped may render the techni- 

 cal definitions more clear and satisfactory, 

 and less difficult to be impressed upon the 

 memory. 



In the list of descriptive terms, the Latin 

 word has been prefixed to the English 

 translation, or derivative ; because it may 

 occur to ladies, or to others who follow, as 

 an amusement, the pursuit of collecting 

 and arranging shells, and who may be un- 

 acquainted with the dead languages, to 

 wish for a reference to some Latin author. 



