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. So it is with tusks,
and teeth, and horns, and spurs, and all such defensive and
offensive weapons.
In the Lobsters alone it is a matter of chance which claw is the
larger, and this in either sex. Claws they must have, because they
belong to a genus in which this is a constant character; but they have
them in this indeterminate way, owing to imperfect formation and to
their not using them for their natural purpose, but for locomotion.
For a detailed account of the several parts of these animals, of
their position and their differences, those parts being also
included which distinguish the sexes, reference must be made to the
treatises on Anatomy and to the Researches concerning Animals.
9
We come now to the Cephalopoda. Their internal organs have already
been described with those of other animals. Externally there is the
trunk of the body, not distinctly defined, and in front of this the
head surrounded by feet, which form a circle about the mouth and
teeth, and are set between these and the eyes. Now in all other
animals the feet, if there are any, are disposed in one of two ways;
either before and behind or along the sides, the latter being the plan
in such of them, for instance, as are bloodless and have numerous
feet. But in the Cephalopoda there is a peculiar arrangement,
different from either of these. For their feet are all placed at
what may be called the fore end
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