The primitive remains, numbering from seventy to eighty, lying between Ventry and Mount Eagle, which rises over the Blasket Sound to the north of Slea Head, were, for the first time, fully described after a proper survey by Du Noyer in 1858. Of these the Fahan group of forts and stone huts is the most remarkable, and shows that a considerable population must have inhabited this wild and remote spot at a very early date. At Coumenoole are ten clochauns. Glen Fahan has six forts containing eighteen clochauns, a triple clochaun, and twenty-three others detached. The triple clochaun is known as _Caher Fada an Doruis_, the ‘Long fort of the door.’ It has been cleared out in recent years. The east and central chambers are connected by a passage 8 feet long; they are circular, and measure 13 feet and 18 feet in diameter internally. The west cell is semicircular; it is connected with the central by a passage 6 feet long, and measures 10 feet by 14 feet. The main cell is entered from the south-east by a sloping passage; and a winding flight of steps, now imperfect, ran round the roof to the top. In Fahan are four forts containing ten clochauns, a group of seven clochauns, and twelve others detached. These by no means exhaust the remains of the settlement, which has been called, by way of archæological pre-eminence ‘The ancient City of Fahan.’ The fort of _Dunbeg_, about two miles east of Slea Head, was formed by erecting a massive stone rampart 15 to 25 feet in thickness across an angular headland. It curved slightly to the east and touched the cliff at both sides; it was no doubt originally of greater length, as the sea has, in recent times, noticeably gained upon the coast. Near the middle the wall is cut by a passage, the entrance of which is 3½ feet high, 3 feet wide at the bottom, and 2 at the top. The passage widens to about 8 feet, and becomes corbelled. The original entrance was 7 feet wide; but it was thus reduced, and a barricade about 4 feet thick added, leaving a space between it and the original wall to the right and left of the entrance for defence with a heavy timber log. The recess to the right was longer than that to the left, to receive the log when not in use. A hole in the top of the wall opened into the recess, in order to wedge the block when in position. About half way through the wall were similar recesses for a like purpose. Two guardrooms in the walls opened into the court within. These had interesting features in the shape of ‘squints’ formed in the stonework communicating with the passage. A clochaun stood inside the fort close to the cliff on the south-east. The plan of the chamber, three sides forming that of a regular figure, and the fourth curved, is said to be unique. When repaired in recent years, a subterranean passage was discovered from the entrance outwards. A series of three earthen mounds with intervening fosses formed an outward defence. A passage ran through stone gateways in each