TO THE MEMBERS 
OF THE 
LINNEAN AND GEOLOGICAL SOCIETIES, 
THIS WORK, 
INTENDED TO ን 
THE HISTORY OF A CLASS OF ANIMALS 
ESSENTIALLY CONNECTED wıru THE SCIENCES 
WHICH IT IS THE OBJECT OF BOTH THESE INSTITUTIONS 
` TO PROMOTE, 
IS MOST RESPECTFULLY INSCRIBED 
BY 
THE AUTHOR, 
f 


