Information on differentia
In the original Cantus index for this manuscript, differentiae were assigned a two-digit code that identified the last note of each differentiae and used a number to distinguish between differentiae in the same mode that shared the same last note. Differentiae that only varied in terms of repeated notes, liquescents, and/or neumation were assigned a lower-case letter in the "Extra" field.
Mitchell, Andrew. Inventory of Napoli, Biblioteca nazionale Vittorio Emanuele III, vi. E. 20. In: Cantus Manuscript Database for Latin Ecclesiastical Chant: Inventories of Chant Sources. Directed by Debra Lacoste (2011-), Terence Bailey (1997-2010), and Ruth Steiner (1987-1996). Web developer, Jan Kolácek (2011-).
Differentiae indexed in consultation with a microfilm facsimile of the manuscript.