What is Actiones Nominatae?

Legal Definition
Formerly the English courts of chancery would make no writs when there was no precedent, and the cases for which there were precedents were called actiones nominatoe. The statute of Westm. 2, c. 24, gave chancery authority to form new writs in consimili casu. Hence arose the action on the case. Bac. Ab. Court of Chancery, A; 17, Serg. R. 195.
-- Bouviers Law Dictionary
Legal Definition
In the English chancery. Writs for which there were precedents. The statute of Westminster, 2, c. 24, gave chancery authority to form new writs in consimili casu; hence the action on the case.
-- Black's Law Dictionary