Indeed, the Stonehenge Bell Barrows are the very crown of the Sepulchral Mound on Salisbury Plain. Unlike the Long Barrow, they are entirely surrounded by a circular ditch, from which material for the Mound has been excavated; within the ditch is a circular area level with the turf, from which the mound rises from five to fifteen feet in a graceful conical form. The diameter will be upwards of one hundred feet, so that the entire structure is considerably larger and more impressive than the Bowl Barrow. 3. "The Disc Barrow," so named by Dr. Thurnam, the great Barrow expert, from its resemblance to a flat dish surrounded by a deep rim. It consists of a circular area, level with surrounding turf, having a diameter of about one hundred feet. This circular area is enclosed by a ditch with a bank on the outside, both usually very regular and well constructed. Within, at the centre, is a mound not more than a foot high containing the sepulchral deposit. Occasionally there are more than one of these minute mounds, which often escape notice by reason of their insignificance. It is very significant that the Disc Barrow is more plentiful around Stonehenge than in any other part of Wiltshire. Elsewhere they are comparatively rare. In the "Round" Barrows it is not uncommon to find that the body has been cremated before interment. In the Bowl and Bell types, about three out of every four bodies have been so disposed of. In Dorset the relative interments, by cremation or otherwise, is four out of five, while in Cornwall cremation is almost universal. Almost without exception, however, the Disc Barrows contain only cremated remains. The existing impression is that these three forms of Round Barrow were in use at one and the same time, but that the Bowl Barrow was the earliest, followed by the Bell, and that the Disc is the latest form of all. From construction, if for no other reason, this hypothesis seems perfectly tenable.