In some Irish tombs the corridor leads to a well-defined chamber. In a curious tomb at Carrickard, Sligo, the chamber was rectangular and lay across the end of the corridor in such a way as to form a T. The whole seems to have been covered with an oval mound. In another at Highwood in the same county a long corridor joins two small circular chambers, the total length being 44 feet. The corridor was once divided into four sections by cross-slabs. The cairn which covered this tomb was triangular in form. In the county of Meath, in the parish of Lough Crew, is a remarkable series of stone cairns extending for three miles along the Slieve-na-Callighe Hills. These cairns conceal chamber-tombs. The cairns themselves are roughly circular, and the largest have a circle of upright blocks round the base. The chambers are built of upright slabs and are roofed by corbelling. Cairn H covered a corridor leading to a chamber and opening off on each side into a side-chamber, the whole group thus being cruciform. In these chambers were found human remains and objects of flint, bone, earthenware, amber, glass, bronze, and iron. Cairn L had a central corridor from which opened off seven chambers in a very irregular fashion. Cairn T consisted of a corridor leading to a fine octagonal chamber with small chambers off it on three sides. The chief interest of these tombs lies in the remarkable designs engraved on some of the stones of the passages and chambers. They are fairly deeply cut with a rather sharp implement, probably a metal chisel. They are arranged in the most arbitrary way on the stones and are often crowded together in masses. There is no attempt to depict scenes of any kind, nor is there, indeed, any example of animal life. In fact, the designs seem to be purely ornamental. The most frequent elements of design are cup-shaped hollows, concentric circles or ovals, star-shaped figures, circles with emanating rays, spirals, chevrons, reticulated figures, parallel straight or curved lines. There seems to be no clue as to the meaning of these designs. They may have been merely ornamental, though this is hardly likely. At New Grange, near Drogheda, there is a similar series of tumuli, one of which has become famous (Fig. 8). It consists of a huge mound of stones 280 feet in diameter surrounded by a circle of upright blocks. Access to the corridor is gained from the south-east side. This corridor leads to a chamber with three divisions, so that corridor and chambers together form a cross with a long shaft. The walls are formed of rough slabs set upright. In the passage the roof is of slabs laid right across, but the roof of the chamber is formed by corbelling. On the floor of each division of the chamber was found a stone basin. [Illustration: Figure 8. Corridor-tomb at New Grange, Ireland (Coffey, _Transactions of the Royal Irish Academy_, 1892.)]