The commentary, by lemmas, does not include text of the Institutiones.
Leaf 357b, at end of text: Eruditissimos Angeli Aretini ... in Institutiones Justinianeas commentarios ex vetustioribus duobus exemplaribus omnibus collatis, interiectisq[ue] rerum summis representauit Pardulphus Prateius.
On leaf 98a, "Substitutionum arbor" (full-page woodcut). The chapter or chapters that follow, on substitutions, can be found in (some) other editions to be identified as the Tractatus substitutionum by Antonius Caius.
Device on t.p.: lion rampant in an oval shield surrounded by an ornamental frame with the figure of sword-wielding Justice at top.
Colophon: Lugduni, Excudebat Claudius Seruanius.
Signatures: a-z⁶ A-Z⁶ Aa-Qq⁶ Rr⁴. Two-column layout.
Includes index.