Marcianus wrote a work in prose, entitled, Περίπλους τῆς ἔξω θαλάσσης ἑῴου τε καὶ ἑσπερίου καὶ τῶν ἐν αὐτ͂ͅ μεγίστων νήσων, The External Sea he used in opposition to the Mediterranean, which he says had been sufficiently described by Artemiodorus. This work was in two books; of which the former, on the eastern and southern seas, has come down to us entire, but of the latter, which treated of the western and northern seas, we possess only the three last chapters on Africa, and a mutilated one on the distance from Rome to the principal cities in the world. In this work he chiefly follows Ptolemy, and in the calculation of the stadia he adopts the reckoning of Protagoras. He also made an epitome of the eleven books of the of Artemiodorus of Ephesus [ARTEMIDORUS, No. 6]. but of this epitome we have only the introduction, and the periplus of Pontus, Bithynia, and Paphlagonia. It was not, however, simply an abridgment of Artemiodorus for Marcianus tells us that he made use of the works of other distinguished geographers, who had written descriptions of coasts. among whom lie mentions Timosthenes of Rhodes, Eratosthenes, Pytheas of Massilia, Isidorus of Charax, Sosander the pilot, Simmias, Apellas of Cyrene, Euthymenes of Massilia, Phileas of Athens, Androsthenes of Thasus, Cleon of Sicily, Eudoxus of Rhodes, Hanno of Carthage, Scylax of Caryanda and Botthaeus; but he says that he followed more particularly Artemiodorus, Strabo, and Menippus of Pergamus. Marcianus also published an edition of Menippus with additions and corrections. [MENIPPUS.]