In the previous pages we have already met with several instances of summit interments, as at Gib Hill, Minning Low, &c., which are certainly not secondary, and we have reason to suspect that more will be found when looked for; and the finding of Roman coins on or near the top of tumuli is too frequent to be accidental, and occurs even in Ireland, where the Romans never went. We shall have occasion to recur to this subject when speaking of the tomb of King Harald Hildetand at Lethra, and then propose to treat it more in detail; but meanwhile it seems clear that the evidence of the coins and the pottery must be allowed to outweigh that of the flints; and if this is so, not only Uley but all the chamber-tumuli in Gloucestershire or Somerset belong either to the Romano-British, or rather to the post-Roman period of British history. [Illustration: 47. Tumulus, Plas Newydd.] [Illustration: 48. Entrance to Dolmen, in Tumulus, Plas Newydd.] Another and even more interesting example of this class has recently been brought to light by the Hon. W. O. Stanley, at Plas Newydd, not far from the great dolmen represented on woodcut No. 50.[193] It is a chamber or cist, 3 feet 3 inches wide by about 7 feet long, and covered by two slabs. Before being disturbed, the supporting slabs must have formed nearly perfect walls, thus distinguishing the cist from those standing on widely-spaced legs. Its principal point of interest, however, is the widely-splayed avenue of stones leading up to it, showing that it was always intended to be visited; and still more curious are the two holes that were pierced in the slab that closed the entrance. The upper part of this slab is now broken off, but so much remains that it is easy to see that they were originally circular and about 10 inches in diameter. Such holed stones are very frequent in Eastern dolmens, and are also common in Cornwall and elsewhere;[194] but what their purpose may have been has not yet been explained. Further on it may be attempted. At present it is the relation of this form of chambered tumuli to external dolmens that principally interests us. [Illustration: 49. Dolmen at Pentre Ifan. From 'Archæologia Cambrensis.']