Passage 2.26.4
ὅτε δὲ παρεγένετο ἐς Πελοπόννησον, εἵπετο ἡ θυγάτηρ αὐτῷ, λεληθυῖα ἔτι τὸν πατέρα ὅτι ἐξ Ἀπόλλωνος εἶχεν ἐν γαστρί. ὡς δὲ ἐν τῇ γῇ τῇ Ἐπιδαυρίων ἔτεκεν, ἐκτίθησι τὸν παῖδα ἐς τὸ ὄρος τοῦτο ὃ δὴ Τίτθιον ὀνομάζουσιν ἐφʼ ἡμῶν, τηνικαῦτα δὲ ἐκαλεῖτο Μύρτιον· ἐκκειμένῳ δὲ ἐδίδου μέν οἱ γάλα μία τῶν περὶ τὸ ὄρος ποιμαινομένων αἰγῶν, ἐφύλασσε δὲ ὁ κύων ὁ τοῦ αἰπολίου φρουρός.
When she came into the Peloponnese, her father accompanied her, still unaware that his daughter carried within her womb a child conceived by Apollo. After she gave birth in the land of the Epidaurians, she exposed the infant on the mountain now called Titthion, though it was then named Myrtion. The child, while thus exposed, was fed with milk by one of the goats grazing about the mountain, and was guarded by the watchdog that protected the herd.