tombs around leitrim

A megalithic tomb consisting of a rectangular chamber and what seems like a forecourt. The forecourt wall is made of drystone walling. The unusual feature of this tomb is the stone blocking the entrance to the tomb, at the bottom of which is a 'port hole' - presumably to allow subsequent burials to take place. The whole is surrounded by the remains of a cairn 60 feet long, The tomb was excavated, but the results were never published....