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CHAPTER XI. 
FOSSIL TESTACEOUS MOLLUSCA, OR SHELLS. 
Lien. 120. Fossit OYSTER, FROM THE CHALK. 
Kemptown, Brighton. 
On Fossit Motiusca.—Numerous as are the fossil remains 
of the various types of animal organization which have 
already passed under review, they are far exceeded in number 
and variety by those of the beings whose mineralized relics 
we now propose to investigate. Although every .one is 
familiar with the external appearance of the shells cast up 
by the waves on the shores of our island, and of those which, 
from their varied colours and elegant forms, are preserved in 
