Excavations of the Warsaw University Institute of Archaeology in an urban villa at Ptolemais, Cyrenaica, yielded an interesting collection of wall paintings from the 3rd cent. AD. These new finds enrich our knowledge about painted decorations of houses in this part of the Roman empire. The wall paintings include mostly high quality imitations of marble plates, which partially bring to mind an opus alexandrinum mentioned in Historia Augusta. This interim publication comprises the most important fragments of the wall paintings preserved in situ.