A book containing the order of religious ceremony and solemn worship prescribed for ecclesiastical functions. The official publications are two: "Ceremoniale Romanum," and "Ceremoniale Episcoporum," both founded upon the old "Ordines Romani." In the United States the "Ceremonial for use of Catholic Churches," approved by Cardinal Gibbons of Baltimore, is in general use. The "Memoriale Rituum," published by order of Benedict XIII, edited by L. A. Clark, contains rites for parochial churches in England. A "Handbook of Ceremonies" by J. B. Mueller, S.J., has been translated into English by A. Ganss and A. Ellis (London, 1929). Many dioceses and monastic orders have their proper ceremonials.