306 RESEMBLANCE TO RECENT LOLIGO. 
semi-transparent substance, resembling horn. 
Their state of preservation is such as to admit of 
a minute comparison of their internal structure 
with that of the pen of the recent Loligo; and 
leads to the same result which we have collected 
from the examination of so many other examples 
of fossil organic remains; namely, that although 
fossil species usually differ from their living repre- 
sentatives, still the same principles of construc- 
tion have prevailed through every cognate genus, 
and often also through the entire families under 
which these genera are comprehended. 
The petrified remains of fossil Loligo, there- 
fore, add another link to the chain of argument 
which we are pursuing, and aid us in connecting 
successive systems of creation which have fol- 
lowed each other upon our Planet, as parts of 
one grand and uniform Design. Thus the union 
of a hag of ink with an organ resembling a pen 
in the recent Loligo, is a peculiar and striking 
association of contrivances, affording compensa- 
tion for the deficiency of an external shell, to an 
animal much exposed to destruction from its 
fellow-tenants of the deep ; we find a similar 
association of the same organs in the petrified 
remains of extinct species of the same family, 
that are preserved in the ancient marl and lime- 
stone strata of the Lias. Cuvier drew Ids figures 
of the recent Sepia with ink extracted from its 
own body. I have drawings of the remains of 
