Sancti tui domine mirabile *

Here and in the two other incipits of responsories found in recto, mention of the responsory verse is omitted.  

The verse of this responsory is Victricem manum tuam, Cantus ID 007592b as derivable from two agreeing sources, the Soeiro breviary P-Brad Ms 657 and the printed 1528 breviary of Evora.