Passage 9.20.4
ἐν δὲ τοῦ Διονύσου τῷ ναῷ θέας μὲν καὶ τὸ ἄγαλμα ἄξιον λίθου τε ὂν Παρίου καὶ ἔργον Καλάμιδος , θαῦμα δὲ παρέχεται μεῖζον ἔτι ὁ Τρίτων. ὁ μὲν δὴ σεμνότερος ἐς αὐτὸν λόγος τὰς γυναῖκάς φησι τὰς Ταναγραίων πρὸ τῶν Διονύσου ὀργίων ἐπὶ θάλασσαν καταβῆναι καθαρσίων ἕνεκα, νηχομέναις δὲ ἐπιχειρῆσαι τὸν Τρίτωνα καὶ τὰς γυναῖκας εὔξασθαι Διόνυσόν σφισιν ἀφικέσθαι βοηθόν, ὑπακοῦσαί τε δὴ τὸν θεὸν καὶ τοῦ Τρίτωνος κρατῆσαι τῇ μάχῃ·
In the temple of Dionysus there is a statue worth seeing. It is made of Parian marble, the work of Calamis. Yet an even greater wonder is presented by the Triton. According to the more solemn account, the women of Tanagra, before celebrating the rites of Dionysus, went down to the sea for purifications. As they were swimming, Triton attacked them, and the women beseeched Dionysus to come to their aid. The god heard their entreaty and overpowered Triton in battle.