The males of all these animals differ from the females, and the
difference between the sexes is most marked in the sepia; for the back
of the trunk, which is blacker than the belly, is rougher in the
male than in the female, and in the male the back is striped, and
the rump is more sharply pointed.

There are several species of the octopus. One keeps close to the
surface, and is the largest of them all, and near the shore the size
is larger than in deep water; and there are others, small,
variegated in colour, which are not articles of food. There are two
others, one called the heledone, which differs from its congeners in
the length of its legs and in having one row of suckers-all the rest
of the molluscs having two,-the other nicknamed variously the
bolitaina or the 'onion,' and the ozolis or the 'stinkard'.