The mosaic paved floor of the central aisle shows different figures: 1) On the threshold a large central arch formed by two pilasters; this main arch, from which hangs an oscillum is flanked by three minor arches on either side (seven spheres of the planets) (Becatti, PI. XIX).
Of the Sacello delle tre Navate (Reg. III, Is. II, 2), which lies near the therms- building of the "Sette Sapienti", it cannot be said with certainty if it was a Mithraeum.