The country west and south of Quimper in the department of Finistère contains a notable concentration of megalithic monuments. They are of various types and some are quite distinct from the better-known monuments of the region round the Gulf of Morbihan in Southern Brittany. The map (pl. I) shows the distribution of the monuments. It is based largely on a survey of the area undertaken in the summer of 1924. I wish to express my thanks to M. Georges Monot of Pont-l'Abbé for his invaluable assistance and guidance in a country in which good roads are few, and the monuments very difficult to locate. The bulk of the work of excavation, in this area, was undertaken by the late P. du Chatellier towards the end of the last century. Many of the monuments were ravaged before he began operations, and even those found more or less intact were rarely preserved after excavation, so that to-day a large proportion are in a very ruined condition. The reports of excavations are to be found in various Breton periodicals and in the French archaeological journals, especially in the volumes of Matériaux pour l'histoire de l'homme. Du Chatellier also gives a summarized account of his work in Les Époques préhistoriques et gauloises dans le Finistère, second edition, Rennes 1907, which covers the whole of the department. The appendix at the end of this paper, which gives a summarized inventory of the monuments of the region, cites references where possible to the reports of excavations.