We have already noticed the cromlechs which form part of the _alignements_ of Brittany. There are other examples in France. At Er-Lanic are two circles touching one another, the lower of which is covered by the sea even at low tide. Excavations carried out within the circles brought to light rough pottery and axes of polished stone. Two fine circles at Can de Ceyrac (Gard) have diameters of about 100 yards, and are formed of stones about 3 feet high. Each has a short entrance avenue which narrows as it approaches the circle, and in the centre of each rises a trilithon of rough stones. Of the definitely sepulchral monuments the dolmen is common in all parts of the French megalithic area. It will suffice to mention the magnificent example known as the Table des Marchands at Locmariaquer. Perhaps the most typical structure in France is the corridor-tomb in which the chamber is indistinguishable from the passage, and the whole forms a long rectangular area. This is the _allee couverte_ in the narrower sense. In the department of Oise occurs a special type of this in which one of the end-slabs has a hole pierced in its centre and is preceded by a small portico consisting of two uprights supporting a roof-slab (Fig 10). A remarkable example in Brittany known as Les Pierres Plates turns at a sharp angle in the middle, and is thus elbow-shaped. [Illustration: FIG. 10. _Allee couverte_, called La Pierre aux Fees, Oise, France. (_Compte rendu du Congres Prehistorique de France_.)] In the north of France the _allee_ is often merely cut out in the surface of the ground and has no roof at all. It is sometimes paved with slabs and divided into two partitions by an upright with a hole in its centre. Tombs of this kind often contain from forty to eighty skeletons, some of which are in the contracted position. The skulls are in some cases trepanned, i.e. small round pieces of the bone have been cut out of them; such pieces are sometimes found separate in the graves. No objects of metal occur in these North French tombs. There are many fine examples in Brittany of the corridor-tomb with distinct chamber. The best known lies on the island of Gavr'inis (Morbihan). It is covered by a tumulus nearly 200 feet in diameter. The circular chamber, 6 feet in height, is roofed by a huge block measuring 13 feet by 10. The corridor which leads out to the edge of the mound is 40 feet in length. Twenty-two of the upright blocks used in this tomb are almost entirely covered with engraved designs. These are massed together with very little order, the main object having been apparently to cover the whole surface of the stone with ornament. The designs consist of spirals, concentric circles and semicircles, chevrons, rows of strokes, and triangles, and bear a considerable resemblance to those of Lough Crew and New Grange in Ireland.