ADVERTISEMENT. 
Tue following pages, intended as a sequence to the 
Conchologist’s Text Book, will, it is hoped, be found 
serviceable to those beginners, who, after having mas- 
tered the difficulties of the genera, are now resolved to 
enrich their specimens by the specific titles also. 
There being no English work on the Lamarkian 
system, that would aid them in their endeavours, the 
author has therefore compiled a descriptive catalogue 
of those shells, which, from their moderate price and 
comparative commonness, will be most likely to reach 
the cabinet of the youthful amateur in this pleasing 
science. The references to figures are solely made to 
modern works—the more ancient, from their rarity 
and costliness, being seldom, if ever, possessed by that 
class of readers for whom this little work is more par- 
ticularly intended. With similar views, four books 
only have been quoted for the iconography ; but where- 
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