These approbations were confirmed by Pope Pius IX on 7 February 1871 for the Cistercians of the Common and the Strict Observance (Trappists).
[1] The Cistercian canonical hours (or Divine Office) was even then quite different from the Roman, as it followed exactly the prescriptions of the Rule of St. Benedict (see Benedictine Rite), with a very few minor additions.
The psalm "Judica" was not said, but in its stead was recited the Veni Creator; the Indulgentiam was followed by the Pater and Ave, and the Oramus te Domine was omitted in kissing the altar.
After the Pax Domini sit semper vobiscum, the Agnus Dei was said thrice, and was followed immediately by Hæc sacrosancta commixtio corporis, said by the priest while placing the small fragment of the Sacred Host in the chalice; then the Domine Jesu Christe, Fili Dei Vivi was said, but the Corpus Tuum and Quod ore sumpsimus were omitted.
Outside of some minor exceptions in the wording and conclusions of various prayers, the other parts of the Mass were the same as in the Roman Rite.