An interesting series of mammalian remains were obtained from the Valley Gravel, which, considering the limited extent of the excavation, and the number of specimens destroyed in the removal of the material, shews this section to be fully as prolific in these remains as the long-worked pits of Erith or Crayford. The specimens have been examined and identified by William Davies, Esq, of the British Museum, who kindly undertook to compare them with those in the national collection. The following is a list of these remains:-- _Elphas primigenius_, Blum. Portion of lower jaw and tooth, and the shaft of a humerus of a young individual. _Rhinoceros tichorhinus_, Cuv. Part of a cranium, a lumbar vertebra, a right metatarsus, and a left metacarpus. _Equus caballus fossilis_, Linn. A right metacarpus, a right radius, and an upper molar. _Bos._ sp. Cervical vertebra. _Cervus elaphus_, Linn. Portion of left ramus of lower jaw, and portion of a right radius. _Cervus tarandus_, Linn. The base of a shed antler. (This had suffered considerable attrition). There were also found a rib and a portion of an ilium of a _Cervus_ (species indeterminable), besides many other fragments too small or too much mutilated for recognition. But the most unusual fossil found in such deposits was that of _Pliosaurus_, a portion of the paddle bone of which was found associated with the remains above mentioned. This fossil, which was probably derived from the Kimmeridge Clay, shewed evident signs of attrition, but not so much as to efface the marks of muscular attachment; it was, moreover, charged with peroxide of iron. Search was made in the anticipation of shells of _Cyrena (Corbicula) fluminalis_ being associated with these remains, but without success. Immediately beneath the Thames Valley Gravel was the London Clay, possessing all the typical features of that formation, without any of the loamy gradations found in higher parts of the metropolis. The top of the clay, however, to a depth varying from 9 to 12 inches, was of a brown colour, resembling the brown (altered) London Clay found at Hampstead and elsewhere.