Some common cause of this kind would seem to be not improbable; and it would not, perhaps, be difficult to ascertain whether it is a _vera causa_ or not. But, with respect to this, observations are at present wanting. From the foregoing data we may conclude:-- (1) That the Perthi-Chwareu bones belonged to a race characterized by the proportionally rather large dimensions of the cranium, whose form presents nothing very remarkable, and is pretty nearly conformable to several of those found by Mr. Laing in the ancient shell-mounds in Shetland.[111] (2) That this form is distinctly different from that of the Mewslade skull, in which the vertical region is somewhat flattened, as is the case also with several Anglesey crania, which, however, appear to pass, by gradual transition, into the Keiss and Perthi-Chwareu shape, through such a form as that of the Towyn-y-capel skull figured by Professor Huxley;[112] and the whole of them consequently may be regarded as belonging to the so-called “River-bed skulls” of that author, excepting the Borris cranium, which appears to belong to a different type altogether. (3) That the people whose remains were found in this locality were of low stature (the mean height, deduced from the lengths of the long bones, being little more than 5 feet), the tallest being 5 ft. 6 in., and the shortest adult not more than 4 ft. 10 in., the intermediate ones being 5 ft. 1 in. and 5 ft. 2 in. (4) That the proportions of the long bones are rather thick, and the muscular impressions in all are very strongly marked. (5) That the _tibiæ_ are, for the most part, of a much more compressed form than those of the modern English, but that this platycnemism does not appear to be exactly of the same kind as that which is exhibited in the Gibraltar bones and in those from Cro-magnon (as figured by M. Broca), the difference consisting in the fact that in the two latter instances the bone is expanded backwards behind the transverse plane at the interosseous ridge as much as it is in front of that plane, whilst in the Welsh _tibiæ_ it is the anterior portion of the shaft only which is expanded; or, in other words, the platycnemism in them is due simply to an absolute compression of the shaft. § 3. HUMAN REMAINS FROM THE CEFN TUMULUS. These remains, as submitted to my inspection, consist of:-- (1) Portions of three frontal bones, two of which are nearly complete, and one constituted of little more than the superciliary region. (2) Two parietals and a left temporal, probably belonging to the same skull as the more mutilated frontal. (3) Portions of four thigh-bones, two left and two right, one of the latter wanting the proximal, the other both extremities. We have thus the remains of three individuals from this interment.