Not toilet paper, as James suggested in his comment. But yes, super glue. Who'da thought?
First Sidy took a flexible double edged razor blade and scraped across the skin to create some dust. I joked that he was mostly getting dried sweat, but no matter.
He made a little pile of the dust on the split at the edge and then impregnated it with super glue and let it dry.
That's it. It will hold for as long as it holds and I am fully reconciled that at some point my beautiful goatskin will have to retire. In the mean time, I am going to order some kevlar rope so that when it does break, I can be ready, as some of the rope on my drum is a bit frayed.