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.

Another tomb in the same district, that of Mané-er-Hroeck, was intact
when discovered in 1863. It contained within its chamber a hoard of 101
axes of fibrolite and jadeite, 50 pebbles of a kind of turquoise known
as _callaïs_, pieces of pottery, flints, and a peculiarly fine celt of
jadeite together with a flat ring-shaped club-head of the same stone.
The tomb was concealed by a huge oval mound more than 100 yards in
length. The famous Mont S. Michel is an artificial mound containing a
central megalithic chamber and several smaller cists, some of which held
cremated bodies.

[Illustration: FIG. 11. Chambered mound at Fontenay-le-Marmion,
Normandy. (After Montelius, _Orient und Europa_.)]

A very remarkable mound in Calvados (Fig. 11) was found to contain no
less than twelve circular corbelled chambers, each with a separate
entrance passage. The megalithic tombs of Brittany all belong to the
late neolithic period, and contain tools and arrow-heads of flint, small
ornaments of gold, _callaïs_, and pottery which includes among its forms
the bell-shaped cup.

In Central and South France the _allées couvertes_ are mostly of a
semi-subterranean type, i.e. they are cut in the ground and merely
roofed with slabs of stone. The most famous is that of the Grotte des