Ancient Coins of Tyre
Lucian tells us that a sea-shell often took the place of the cup, as a vessel in which to hold the water where the needle floated, and hence upon the ancient coins of Tyre we find a sea-shell represented.
Here, too, we have the Pillars of Hercules, supposed to have been placed at the mouth of the Mediterranean, and the tree of life or knowledge, with the serpent twined around it, which appears in Genesis; and in the combination of the two pillars and the serpent we have, it is said, the original source of our dollar mark [$].