From December 18 to 23, III and IV class votive and Requiem Masses are prohibited.
Proper Mass; no Gloria nor Credo; common Preface.
N.B. More information on Ember Days and particular rubrics on the Flectamus genua can be found in Rubrical FAQs.
Matins: Invitatorium Prope est iam; Hymn Verbum supernum; Wednesday psalms and antiphons, the last three are taken from the 2nd scheme; no Te Deum
Lauds: Wednesday psalms of the 2nd scheme; antiphons are proper (they are given in the psalter: Feria IV ante Vigiliam Nativitatis Domini).; Hymn En clara vox; preces are said
Hours: Wednesday psalms with antiphons from Lauds
Vespers: Wednesday psalms and antiphons; Hymn Creator alme siderum; Magnificat O Clavis David (O Antiphons for Advent); preces are said