The title of a book containing the liturgical customs or consuetudines of individual churches, especially those of monastic orders. The purpose of such books was not only to record peculiar monastic customs, but also to render the liturgy conformable to a particular monastic rule. Producers of such works were, among others, Mabillon, "Vetera analecta"; d'Archery, "Spicilegium"; Herrgott, "Vetus disci plina monastica"; Martene, "De antiquis monachorum ritibus."