Reference edition:

Grammatici Latini, V. Artium Scriptores minores. Cledonius Pompeius Iulianus etc., ex recensione H. Keilii, Hildesheim 1961, 326, 25-30 (reprografischer Nachdruck der Ausgabe, Leipzig 1868)

Keil printed a snippet (GL 5.326.25-30) concerning the nominative forms lact vs. lac  from an eleventh century manuscript containing a commentary on Donatus de octo partibus orationis drawing primarily on Pompeius, Priscian, and Consentius. [R. Kaster]