What is Actio Non Ulterius?

Legal Definition
In English pleading. A name given to the distinctive clause in the pica to the further maintenance of the action, introduced in placa of the plea puis darrein continuance; the averment being that the plaintiff ought not further (ulterius) to have or maintain his action. Steph. PI. 64, 65, 401.
-- Black's Law Dictionary
Legal Definition
The plaintiff should not be allowed further to pursue his action.
-- Ballentine's Law Dictionary