e 
Vi ADVERTISEMENT. 
ever no illustrative drawing was to be met with in 
them, the outline has been added in the accompanying 
plates. 
Tt need only be further stated, that for the selection 
of the best descriptions, continual comparisons have 
been made of the different writers on the subject ; and 
scarcely in a single instance have the characteristics 
of a shell been given without the shell itself being either 
in the author’s possession, or before his eyes. 
Several very useful additions have been made to this 
edition, viz. an “ Index to the Genera, with a List of 
the described Species, their localities, and the authorities 
> 
for their names ;” and a“ Glossary of Terms used in 
Conchology,” &c. &c. 
London, March, 1842. 
B. British. 
W. Wood’s Catalogue of Shells. 
S. Sowerby’s Manual of Conchology. 
T. Turton’s Manual of Land and Freshwater Shells. 1st edition. 
E. Encylopédie Méthodique. 
The size is expressed by inches. 
