 They are called "partes decisae".The new compilation bore no special title, but was called "Decretales Gregorii IX" or sometimes "Compilatio sexta", i. e. the sixth collection with reference to the "Quinque compilationes antiquæ".It was also called "Collectio seu liber extra", i. e. the collection of the laws not contained ("vagantes extra") in the "Decretum" of Gratian.