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Pygopterus mandibularis. Agassiz. Marl-slate. a. Outside of scale, magnified. b. Acrolepis Sedgwickii, Agassiz. Outside of scale, magnified. We are indebted to Messrs.
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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