Stock and horn
Hornpipe with a mouthpiece: yoke / single chanter, bell / reed type?
Baines refers to 1 example of a single hornpipe with "parallel bores", which seems to be a contradiction, unless he means that it has parallel double fingerholes (i.e. oo, as in recorders with a "baroque bore").
Wooden pipe and Reed-cap.
Baines, Anthony: Bagpipes [1960]. Oxford, 1973 (revised), p.32 (»Langwill), 132.