10 THE SHELL-FISH OF THE COAST. 
various tunics and bodies which belong to the most 
perfectly constituted eye. 
Should you have succeeded in catching or finding 
a squid, then follow me in the examination of its 
parts. Observe the ten arms (or more properly feet, 
as it is by means of these that the animal walks or 
creeps about, head downward), two longer (ten- 
tacles) than the remaining eight, and the peculiar 
cup-like bodies with which they are furnished at 
their extremities. These so-called ‘acetabula’ are 
in reality organs of adhesion, each one acting op 
the vacuum process which is familiar to all boys 
who have experimented in brick-lifting with the 
leather ‘sucker’ and string. The animal can, there- 
fore, not only entwine its arms about the object of 
its special search, but can stick to it by means of its 
sucking disks. Look between the arms, and at their 
base you will observe the mouth; gently separate 
the mouth, and you will bring to light a pair of re- 
markable jaws or beaks, almost exactly like those 
of a parrot, only reversed,—z.e., the larger beak is 
below, and the small one above. On one side of the 
animal—which would be the rear, if the creature 
were held head downward—you will observe in the 
gill-cavity, which is enclosed in a lap of the body- 
mantle, the peculiar tubular organ known to nat- 
uralists as the ‘funnel.’ Through this funnel much 
of the water that is contained in the gill-cavity, and 
is used in the aération of the blood, is periodically 
passed out by the animal. The stream of ejected 
water, reacting upon the surrounding medium, 
causes a rebound in the animal, the extent of which 
