Leaves from an antiphonary

Fragment, bifolium: 585 x 395 mm. Opening is non-consecutive leaves. Contains music and text, possibly from Inventio Crucis, the feast celebrating the finding of the cross. First leaf of the bifolium is numbered "185" in ink and in a later hand; second, non-consecutive leaf has no foliation. Incipit: Benedic anima mea dominum. Music Notation: Square notes on five-line staffs.