The two reclining busts probably show the god Atlas from Greek mythology. Atlas and his brother Menoetius sided with the Titans in their war against the Oylmpians.
When the Titans were defeated many of them were confined to Tartarus, but Zeus, King of all the Gods condemned Atlas to stand at the western edge of the earth and hold the sky up on his shoulders to prevent the two from resuming their primordial embrace.
Thus he was Atlas Telamin, or enduring Atlas and became a doublet of Coeus, the embodiment of the celestial axis around which the heavens revolve.
Strasbourg, circa 1700
These two carved stone although now lying down have the same posture as if they were carrying a weight on their backs.