Passage 8.31.1
τὸ δὲ ἕτερον πέρας τῆς στοᾶς παρέχεται τὸ πρὸς ἡλίου δυσμῶν περίβολον θεῶν ἱερὸν τῶν Μεγάλων. αἱ δέ εἰσιν αἱ Μεγάλαι θεαὶ Δημήτηρ καὶ Κόρη, καθότι ἐδήλωσα ἤδη καὶ ἐν τῇ Μεσσηνίᾳ συγγραφῇ· τὴν Κόρην δὲ Σώτειραν καλοῦσιν οἱ Ἀρκάδες. ἐπειργασμένοι δὲ ἐπὶ τύπων πρὸ τῆς ἐσόδου τῇ μὲν Ἄρτεμις, τῇ δὲ Ἀσκληπιός ἐστι καὶ Ὑγεία.
At the other end of the colonnade, towards the west, is an enclosure sacred to the Great Goddesses. Now, these Great Goddesses are Demeter and the Maiden, as I have previously mentioned in my account of Messenia; however, the Arcadians call the Maiden "Saviour." In relief sculptures in front of the entrance, Artemis is depicted on one side, and on the other side are Asclepius and Hygieia.