This nymphaeum is a late-antique embellishment of the Decumanus Maximus (opus latericium from the first quarter of the fourth century AD). The structure is 1.70 metres above the level of the Decumanus. In the curved back wall are five semicircular and rectangular niches. In front and on either side of the niches are masonry bases for columns. In the niches must have been statues, and below the niches are holes from which water flowed into the basin in front. The walls of the nymphaeum were decorated with marble. It may have been covered with a semicupola.