Since the discovery of remains of air-breathing Vertebrates in the Coal-shales of Carluke,* several other evidences of a like grade of organization have been obtained from scotch Carboniferous deposits; but I had not, until the present year, seen any such fossils from English or Welsh formations of the same antiquity. The spencimens figured in Plate I., however, give evidence of the fact. They were discovered by John Edward Lee, Esq., F.G.S., in the much disturbed coal-beds at Llantrissent. Glamorganshire, which are referable to the lower part of the ‘Middle,’ if not to the upper part of the ‘Lower’ Coalmeasures.