I came across this in the Bodleian Ballad library recently, and it raised a few questions

A Planxty (Land of Shillelah)

I though a Planxty was usually instrumental? Or is it just that the words have been lost?

Is there a song or tune of this name known? I couldn't find one.

Unfortunately, all three copies online are mostly illegible, although the words could probably be recovered by examination of the slips themselves.