Passage 9.29.5
ἐν Ἑλικῶνι δὲ πρὸς τὸ ἄλσος ἰόντι τῶν Μουσῶν ἐν ἀριστερᾷ μὲν ἡ Ἀγανίππη πηγή ---θυγατέρα δὲ εἶναι τὴν Ἀγανίππην τοῦ Τερμησσοῦ λέγουσι, ῥεῖ δὲ καὶ οὗτος ὁ Τερμησσὸς περὶ τὸν Ἑλικῶνα---, τὴν δὲ εὐθεῖαν ἐρχομένῳ πρὸς τὸ ἄλσος ἔστιν εἰκὼν Εὐφήμης ἐπειργασμένη λίθῳ· τροφὸν δὲ εἶναι τὴν Εὐφήμην λέγουσι τῶν Μουσῶν.
On Helicon, as one proceeds toward the grove of the Muses, there is on the left side the spring Aganippe. They say Aganippe was the daughter of Termessus, and this Termessus also flows around Helicon. Continuing straight ahead towards the grove, one encounters an image of Eupheme, carved in stone. Eupheme, they say, was the nurse of the Muses.