"LONGFORMACUS, a parish, consisting of a main body and a detached section, in the north of Berwickshire. Its post-town is Dunse. Its main body is bounded by Haddingtonshire, and the parishes of Cranshaws, Abbey St Bathans, Dunse, Langton, and Lauder ... The detached section lies 2 miles east of the nearest point of the main body; is bounded by Abbey St Bathans, Buncle, and Dunse ... The present parish comprehends the ancient parishes of Longformacus and Ellam, which were united before the year 1750."
From the Imperial Gazetteer of Scotland, edited by John Marius Wilson, 1868.