See Bannister, H. M. Monumenti vaticani di paleografia musicale latina ID# 850[ several pieces, some in mensural notation]
Only four manuscripts were digitized this week, one each from Barb.lat and Vat.lat, and two from Ott.lat.
To the right is f.16v from Ott.lat.3388, a collection of assorted polyphonic chants. This contains the start of the first two parts of a four-part setting of Alma Redemptoris Mater, an antiphon for the Feast of the Annunciation, but also sometimes fit into other Marian feasts. Strangely this setting seems to be missing the first word.
At the bottom is a diagram of some sort of cutting tool (I think) from f.31v of Ott.lat.3324. This is a Spanish text by Pero Lopez de Ayala, a 14th C Castilian polymath.
See Bannister, H. M. Monumenti vaticani di paleografia musicale latina ID# 850[ several pieces, some in mensural notation]