Crustaceans copulate,

as the crawfish, the lobster, the carid
and the like, just like the opisthuretic quadrupeds, when the one
animal turns up its tail and the other puts his tail on the other's
tail. Copulation takes place in the early spring, near to the shore;
and, in fact, the process has often been observed in the case of all
these animals. Sometimes it takes place about the time when the figs
begin to ripen. Lobsters and carids copulate in like manner.