D) The Semifestive Office
152 (168). The semifestive Office belongs to feasts of the II class. It is arranged as follows:
a) At Matins, Lauds, and Vespers: everything as in the festive Office;
b) At Prime: antiphon and psalms are from the Psalter, of the current day of the week; little chapter and the rest are as in the Ordinary; short lesson is of the Season.
At Pretiosa the Gospel is read.
c) At Terce, Sext, and None: antiphons and psalms from the Psalter for the current week day; the rest, from the feast, as in the Proper or Common.
d) Compline: of Sunday.