The Office Matins for the Dead begins immediately after the Lauds of the Day ends:
Lauds of the Day
V. Let us bless the Lord.
R. Thanks be to God.
Matins of the Dead starts here with the Invitatory & Venite (p. H8). Unless Matins of the Dead is said as the only Office of day. In that case the Triple Prayer (Our Father, Hail Mary & Apostles Creed) are said in secret before the Office.
The Nocturns can be said in different ways. Looking at Nocturn I the Rubrics present the option to say only one Nocturn instead of three for the Matins of the Dead (a preferable option for those of us who have families and day-time jobs). If only one Nocturn is said Nocturn I is said on Sundays, Mondays, and Thursdays. The remaining two Nocturns are distributed in a similar way. For Memorial Day, which is Monday (tomorrow) this Nocturn would be used for the Matins of the Dead if only one Nocturn is said. The Antiphons are doubled.
After the Nocturn is completed the Lauds of the Dead immediately follow. The Dual Prayer is not said, nor the Opening Versicles. Lauds begins immediately with the first Antiphon. Lauds continues in the same way as does the Vespers of the Dead. Psalm 130 is not said (because the Antiphons are doubled in the Office), instead moving on to:
V. From the gate … (and the rest)
There is a selection of Collects offered but for Memorial Day I would go with Collect nr. 13. If commemorating friends and/or relatives Collects 6,7, 9, 10 and 11 seem appropriate.
The Office ends as did Vespers of the Dead:
V. Rest eternal …
R. And let …
V. May they rest …
No final Our Father, no Marian Antiphon, no Prayer after the Office.
Fr. Gregory Wassen