30 Beautiful Shells. 
Properly to treat of fossil shells would require 
a book of itself, and a large book too; we can here 
but allude to the subject, as a part, and a very 
important and interesting part, of the study of © 
Conchology ; more will be said about it in a volume 
which we purpose writing for this series, on Rocks, 
and the petrified organic remains found in and 
about them. 
“ Those relics of an older world, which tell 
Of changes slow or sudden, that have past 
Over the face of Nature; fossil shell, 
Shark’s tooth, and bone of megatheran vast, 
Turned into stone, and so preserved to show 
Man of those things whereof he ought to know.” 
