Passage 2.3.9
ἔπη δὲ ἔστιν ἐν Ἕλλησι Ναυπάκτια ὀνομαζόμενα· πεποίηται δὲ ἐν αὐτοῖς Ἰάσονα ἐξ Ἰωλκοῦ μετὰ τὸν Πελίου θάνατον ἐς Κόρκυραν μετοικῆσαι καί οἱ Μέρμερον μὲν τὸν πρεσβύτερον τῶν παίδων ὑπὸ λεαίνης διαφθαρῆναι θηρεύοντα ἐν τῇ πέραν ἠπείρῳ· Φέρητι δὲ οὐδέν ἐστιν ἐς μνήμην προσκείμενον. Κιναίθων δὲ ὁ Λακεδαιμόνιος---ἐγενεαλόγησε γὰρ καὶ οὗτος ἔπεσι ---Μήδειον καὶ θυγατέρα Ἐριῶπιν Ἰάσονι εἶπεν ἐκ Μηδείας γενέσθαι· πέρα δὲ ἐς τοὺς παῖδας οὐδὲ τούτῳ πεποιημένα ἐστίν.
There is among the Greeks a poem called the "Naupactia," in which it is related that Jason, after the death of Pelias, migrated from Iolcus to Corcyra, and there his eldest son, Mermerus, was destroyed by a lioness while hunting upon the adjoining mainland. Of Pheres no record whatever is preserved. Cinaethon of Lacedaemon—since he too composed genealogical poetry—relates that Medeius and a daughter, Eriopis, were born to Jason by Medea; but of Jason's children beyond these, even he records nothing further.