310 THE MEDALS OF CREATION. Cuar. VIII. 
that enter into the composition of the skeleton of a single 
Pentacrinite or Encrinite is considered, the prodigious quan- 
tity of the fossil remains of these zoophytes in the ancient 
deposits may be readily conceived. Polished slices of the 
encrinital marbles of Derbyshire, and of the Lias limestones 
from Lyme Regis and Charmouth, should be obtained, as 
they show sections of the imbedded crinoidal stems and 
detached ossicula ; and sometimes of the receptacles. 
