Against the south wall of the garden stood a shrine. It comprised a sort of aedicula painted entirely red which was situated within a basin. On the front was a niche in the shape of a house. Inside was a painting of a Genius, with a patera and a cornucopia, sacrificing on an altar. The figure stood among plants. On the interior walls of the niche were small white flowers. Under the niche was a depiction of the river god Sarnus lying near a building on a reed bank, holding a cane and an amphora from which water flowed. To the right of
Sarnus was a scene of commercial activity depicting goods (believed to be onions by Jashemski) being loaded onto a boat. Two mules were shown carrying produce. The arch of the structure was decorated with sea monsters. The external sides were decorated with plants and birds. During excavation, a pair of bronze Lares statuettes were found in the niche along with a lamp and a cup.