At the rear of the house was a large nymphaeum, housed in its own room. The nymphaeum sat high on a podium that ran the length of the southern wall and consisted of a large vaulted semi circular niche, with a sort of plain aedicula façade. The façade consisted of two rectangular pilasters which supported a plan pediment with a simple peak at the top. Painted in the centre of this pediment was a shell like object. The remainder of the strutcure was decorated in mosaic featuring a scallop design of various blue, white, and yellow tesserae. The interior of the niche was decorated to match the façade. It was outlined by real shells, which also acted as a sort of cornice running the curve of niche. While much of the inteior decoration does not survive, it appears that the ceiling of the niche was decorated with the traditional shell motif. At the base of the niceh was a marble staircase which carried water into the square pool below. At the base of this structure was a depicting of a reclining woman. On either sides of the staircase were two pilasters, which supported those of the niche above, painted in red and cream imitation marble with their edges outline with red stripes.