It is the same

with the dolphin and with all cetaceans; that
is to say, they come side by side, male and female, and copulate,
and the act extends over a time which is neither short nor very long.

Again, in cartilaginous fishes the male, in some species,
differs from the female in the fact that he is furnished with two
appendages hanging down from about the exit of the residuum, and
that the female is not so furnished; and this distinction between
the sexes is observed in all the species of the sharks and dog-fish.