Of the grey mullets,

the chelon begins to be in roe between
the

The molluscs also breed in spring. Of the marine molluscs one of
the first to breed is the sepia. It spawns at all times of the day and
its period of gestation is fifteen days. After the female has laid her
eggs, the male comes and discharges the milt over the eggs, and the
eggs thereupon harden. And the two sexes of this animal go about in
pairs, side by side; and the male is more mottled and more black on
the back than the female.