Praetorius calls this an octave lute, with the chanterelle C or D.
The night I heard him he played the Mendelssohn concerto, and at the beginning of the slow movement his chanterelle broke.
It had from four to eight courses of strings, the chanterelle or melody string being single and the others in pairs of unisons.
In the tables of accordance here given, the chanterelle is indicated by a X.
The chanterelle does not lie over the finger-board and is always played open by the thumb.