Important note
You can move the mouse pointer over the image to see exactly what is the contraction mark

contraction for per or par -- a p with a horizontal line through its descender, sometimes looped upwards from the tail of the p, as here.

part - the horizontal stroke through the tail of p represents per- or par-

contraction for pre

-rac[i]on: the horizontal line signifies the omission of minims [although it can also be a general contraction mark], in this case the i between c and o.

eu[er]; the contraction for medial or final -er- is a looped or sometimes angular flourish above the line.

Lord[es] - the suspension at the end represents -es [sometimes -is].