I Have been favoured by Mr. L. Richardson, F.G.S., of Cheltenham, with the loan of a small compound coral which he took from the Lower Rhætic Beds at Deerhurst (Gloucestershire). It is undoubtedly a species of Heterastrœa , differing chiefly from the several Liassic species in the small size of the corallum, and in the small size of its calices. Mr. Richardson writes of its locality and stratigraphical position as follows:— ‘The exposure where the coral was obtained is situated about three-quarters of a mile east-south-east of Deerhurst Church, in a deeply-cut wheel-track. The gate giving access to this track is almost opposite a barn which is situated less than a quarter of a mile south-west of ‘The Folly.’ The Upper Keuper red marls constitute the subsoil of the field, and in the bank opposite the oak-tree the Tea-green Marls are visible. In the winter of 1901 the following beds were revealed by a very little excavating, but unfortunately the measurements were not taken From the foregoing it is evident that the coral occurs only a very little way above the Bone-Bed, which there, as in many other places, is a hard micaceous sandstone. It is specifically new, and generically new to the Rhætic formation, and, as I shall presently show, has a very Jurassic relationship. The corallum, as is so commonly the case with the compound corals of the Rhmtic deposits, is small, and, so far as may be determined by the much-embedded specimen, has a somewhat peduncular form,with a