17.

Of the plains, the first reckoning from the sea is called Macras and Macra-pedium. Here Poseidonius says there was seen a serpent lying dead, which was nearly a plethrum in length, and of such a bulk and thickness that men on horseback standing on each side of its body could not see one another; the jaws when opened could take in a man on horseback, and the scales of the skin were larger than a shield.