The commonest species of the genus Metriorhynchus occurring in the Oxford Clay of the Peterborough district is Metriorhynchus superciliosus (Desl.). The species found in the above locality has been identified with that of Deslongehamps by the late Mr. J. W. Hulke, F.R.S., in his paper “On the Skeletal Anatomy of the Mesosuchia” (Proc. Zool. Soc. London, November 20th, 1888), and also by Mr. Lydekker in the “Catalogue of Fossil Reptilia and Amphibia,” part iv, Suppt., p. 232. Mr. Lydekker, at the time he compiled the Catalogue, brought a east of part of the skull of M. supercilicsus to compare with the numerous skulls in the Eyobury Collection.