I do not find this Codex Augustinus mentioned elsewhere by any of the Editors under that name:  but the Augsburg MSS. were removed to Munich in 1806, and in the older Munich MS. (Cod. Monac. i), the title of the first Mystagogic Lecture is Μυσταγωγία πρώτη ᾽Ιωάννου ἐπισκόπου ῾Ιεροσολύμων.  Also in Codd. Monac. 2, Ottobon. there is added at the end of the Title, τοῦ αὐτοῦ Κυρίλλου καὶ ᾽Ιωάννου ἐπισκόπου.  That John, Cyril’s successor, did deliver Catechetical Lectures, we know from his own correspondence with Jerome:  and this very circumstance may account for his name having been associated with, or substituted for that of Cyril.