Nicene and Post-Nicene Fathers, Ser. II, Vol. XIV:
The Canons of the Synods of Sardica, Carthage, Constantinople, and Carthage Under St. Cyprian, Which Canons Were Received by the Council in Trullo and Ratified by II. Nice.: Canon LXXVII

Canon LXXVII.  (Greek lxxx.)

Of Cresconius.

Concerning Cresconius of Villa Regis this seemed good to all, that the Primate of Numidia should be informed on this matter so that he should by his letters summon the aforementioned Cresconius in order that at the next plenary Council of Africa he should not put off making an appearance.  But if he contemns the summons and does not come, let him recognize the fact that sentence should be pronounced against him.

Notes.

Ancient Epitome of Canon LXXVII.

Unless Cresconius who has been summoned by letter to the Synod, shall appear, let him know that he will have sentence given against him.

This canon was probably formerly an appendix (so Hefele thinks) to Canon xj., of the Synod of Carthage of September 13, 401.