PREFACE. XIX 



new genera, as suggested by certain modern 

 conchologists. 



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 spe- 

 cies, it is hoped may render the technical 

 definitions more clear and satisfactory, and 

 less difficult to be impressed upon the me- 

 mory. 



In the list of descriptive terms, the Latin 

 word has been prefixed to the English trans- 

 lation, 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 unac- 

 quainted with the dead languages, to wish 

 for a reference to some Latin author. In 



