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 PALAEONTOLOGY by Dixon (as Pycnodiis) on the evidence of a specimen of the dentition in the Brighton Museum from Cuckfield ; this specimen, we believe, still remains unique. To a different group of ganoid fishes belongs Neorhombolepis valdensis, a species typified by a fossil fish coiled up in a waterworn sandstone boulder from the Wealden of Hastings now preserved in the British Museum. The genus to which this unique specimen belongs is typified by a species from the Kentish Chalk, and also includes a third repre- sentative from the Chalk of Kent and Surrey. 39