Part of a mould for a large Arretine ware bowl decorated with Dionysian motifs. The main register is divided by crossed thyrsoi linked by a garland of laurel leaves, from which bucrania hang; bunches of grapes and vine leaves below the thyrsoi. Within the space defined by the thyrsoi are two large masks: one depicting a youthful satyr, and the other a bearded Silenus, the latter remaining only in part. Both wear wreaths of ivy leaves and berries. Upper rim is decorated with a tongue frieze, the lower register with alternating acanthus and leaves of water plants. The exterior is smooth. The stamps used for the mask motifs are attributed to the Tigranus phase of the workshop of M. Perennius from Arretium (c.15 BC-10 AD). Reassembled from five fragments.