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. In natural sequence we should next go on to
the organs of generation, as yet undescribed, on which depend the
distinctions of male and female. But, inasmuch as we shall have to
deal specially with generation hereafter, it will be more convenient
to defer the consideration of these parts to that occasion.
5
Very different from the animals we have as yet considered are the
Cephalopoda and the Crustacea. For these have absolutely no viscera
whatsoever; as is indeed the case with all bloodless animals, in which
are included two other genera, namely the Testacea and the Insects.
For in none of them does the material out of which viscera are
formed exist. None of them, that is, have blood. The cause of this
lies in their essential constitution. For the presence of blood in
some animals, its absence from others, must be included in the
conception which determines their respective essences. Moreover, in
the animals we are now considering, none of those final causes will be
found to exist which in sanguineous animals determine the presence
of viscera. For they have no blood vessels nor urinary bladder, nor do
they breathe; the only part that it is necessary for them to have
being that which is analogous to a heart. For in all animals there
must be some central and commanding part of the body, to lodge the
sensory portion of the soul and the source of life
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