II class
White
Commemoration of St. Thomas of Canterbury, Bishop and Martyr
Mass Puer natus assigned to the days within the Octave of the Nativity (in the Missal, immediately following December 28); Gloria; commemoration of St. Thomas of Canterbury; Credo; preface and Communicantes of the Nativity
Matins: Invitatorium, Hymn, and 9 antiphons and 9 psalms from the Nativity (joined, not said as three nocturns); verse as found at the conclusion of the psalms for the Nativity (in its third nocturn); 3 lessons proper to December 29; Te Deum
Lauds: Antiphons of the Nativity with Sunday psalms; Hymn A solis ortus; commemoration of St. Thomas of Canterbury
Hours: Psalms and antiphons of the feria; remainder as on the feast of the Nativity
Vespers: Of the Nativity
Compline: Of Sunday
Within the Octave of the Nativity, I and II class votive Masses of the Dead are permitted