sentences:  The title of Earl of Selkirk devolved on the 12th Duke of Hamilton.The subsidiary title of Lord Daer and Shortcleuch became dormant.St Mary's Isle, the Kirkcudbright Seat of the Earl of Selkirk, in Kirkcudbright Parish, of Kirkcudbrightshire, is a finely wooded peninsula, projecting southwestward into the head of Kirkcudbright Bay, on the right bank of the River Dee.