FEEDING OF MARINE ANIMALS
207
‘suckers and held away from the body of the attacker.
The
mouth of the octopus and squid is in the/centre of the
arms
and possésSes a pair of eXtremely powerful horny
jawæ (Plate 78), shapedlike the beak of aparrot, and also
a small radula.
After the prey has been seized it is bitten
into by the jaWs and a poison poured in Which quickly kills
it.
The esh is then dissolved away by means of digestive
.
]u1ces produced by special glands and the uid sucked in
through the mouth.
In this manner the shell of a crab is
cleaned out and then discarded.
'
-
_
The Grab and 'lobster family are mainly scavengers,
feeding on whatever they can obtain, dead or alive, plant
or animal.
They seize their food by means of their powerful
pincer-like claws in which it is_rst Crushed and. then pushed
_
towards the mouth which is guarded by a whole series of
jaWs‘ahd other appendages by means of which the food
is torn up and shredd‘ed out— until it can be easily Swallowed.
'
Thé stomach of these animals is.lined with a horny substance
and has also three -teeth which are worked by muscles
attached to the shell and in such a way that=allthreecome
together in the centre of the stomach
the food
_
still further so that it can
be digest6d by the animal“.
FEEDING OF MARINE VERTEBRATES
,
'
Broadly speaking, the Sh may be dividedint0 two classes,
those which feed on the“plankton, and those which feed on
the larger'swimming
more especially,
the bottomliving animals. i- Of the
the,_herring and mackerel
are-the best kn0wnànd most‘_ important, both of them
swimming about freelÿ in mici—water. They feed by strain—
ing great quatities of water over the
where the
plankton, especially the ”small crustaœan copepods, is
collected in a sieve Consisting of a parallel series of sler‘1de‘r
_
hornyprojections from the front side of each gill arch and
207
‘suckers and held away from the body of the attacker.
The
mouth of the octopus and squid is in the/centre of the
arms
and possésSes a pair of eXtremely powerful horny
jawæ (Plate 78), shapedlike the beak of aparrot, and also
a small radula.
After the prey has been seized it is bitten
into by the jaWs and a poison poured in Which quickly kills
it.
The esh is then dissolved away by means of digestive
.
]u1ces produced by special glands and the uid sucked in
through the mouth.
In this manner the shell of a crab is
cleaned out and then discarded.
'
-
_
The Grab and 'lobster family are mainly scavengers,
feeding on whatever they can obtain, dead or alive, plant
or animal.
They seize their food by means of their powerful
pincer-like claws in which it is_rst Crushed and. then pushed
_
towards the mouth which is guarded by a whole series of
jaWs‘ahd other appendages by means of which the food
is torn up and shredd‘ed out— until it can be easily Swallowed.
'
Thé stomach of these animals is.lined with a horny substance
and has also three -teeth which are worked by muscles
attached to the shell and in such a way that=allthreecome
together in the centre of the stomach
the food
_
still further so that it can
be digest6d by the animal“.
FEEDING OF MARINE VERTEBRATES
,
'
Broadly speaking, the Sh may be dividedint0 two classes,
those which feed on the“plankton, and those which feed on
the larger'swimming
more especially,
the bottomliving animals. i- Of the
the,_herring and mackerel
are-the best kn0wnànd most‘_ important, both of them
swimming about freelÿ in mici—water. They feed by strain—
ing great quatities of water over the
where the
plankton, especially the ”small crustaœan copepods, is
collected in a sieve Consisting of a parallel series of sler‘1de‘r
_
hornyprojections from the front side of each gill arch and