Also known as the fountain of piazza Giudia (or Giudea) as it came from the square in the old ghetto demolished in 1888, this fountain carved by Pietro Gucci is considered to be one of the better creations of the architect Giacomo della Porta. A white marble, elongated basin rests on a base of two steps. In the centre a baluster supports a circular basin with a central jet from which water falls into the lower basin from four masks inspired by the Gorgons, with snakes in their hair, who spout water throught wide open mouths.