NAKED MOLLESK.S. 
303 
SECTION II. 
••’OSSIL REMAINS OF NAKED MOLLUSKS, PENS, AND 
INK-BAGS OF LOLIGO. 
It is well known that the common Cattle Fish, 
other living species of Cephalopods,* which 
have no external shell, are protected from their 
enemies by a peculiar internal provision, con- 
sisting of a bladder-shaped sac, containing a 
hlack and viscid ink, the ejection of which 
defends them, by rendering opaque the water in 
''^hich they thus become concealed. The most 
familiar examples of this contrivance are found 
*0 the Sepia vulgaris, and Loligo of our own seas. 
(See PI. 28, Fig. 1.) 
It was hardly to he expected that we should 
had, amid the petrified remains of animals of the 
* The figure of the common Calmar, or Squid (Loligo Vul- 
garis Lam. — Sepia loligo of Linnaeus), see PI. 28, Fig. 1, 
''lustrates the origin of the term Cephalopod, a term applied to 
a large family of molluscous animals, from the fact of their feet 
being placed around their heads. The feet are lined internally 
"'•th ranges of horny cup.s, or suckers, by which the animal 
Seizes on its prey, and adheres to extraneous bodies. The 
in form and substance resembles a Panot’s beak, and is 
surrounded by the feet. By means of these feet and suckers the 
Sepia octopus, or common Poulpe (the Polypus of the ancients), 
‘trawls with its head downwards, along the bottom of the sea. 
