“They had their hands, which were behind them, tied with serpents: through their loins these thrust the tail.”
. . . . .
After the poets reach the end of the bridge, they can see the masses of serpents and sinners in the seventh chasm where the Thieves reside. The sinners are naked, and their hands are tied behind them with a serpent whose head and tail are threaded through the spirit's body at the loins and tied in coils and knots at the front. Another serpent sinks its fangs in the neck of a shade, who immediately takes afire, burns to ashes, and falls on the ground, only to resume its shape and its torment once again.