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It is likewise to be observed, that the fishes of this age, to the genera of which the names palaeoniscus, catopterus, platysomus, &c., have been applied, vanish, and henceforth appear no more.
At East Thickley, in Durham, where it is thirty feet thick, this slate has yielded many fine specimens of fossil fish of the genera Palaeoniscus ten species, Pygopterus two species, Coelacanthus two species, and Platysomus two species, which as genera are common to the older Carboniferous formation, but the Permian species are peculiar, and, for the most part, identical with those found in the marl-slate or copper-slate of Thuringia.
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