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Fish of Early Devonian Era, Gemuendina Stuertzi, Prussia
Ostracaderms, (Jawless Fish) from West of England, Early DevonianEarly Devonian Ostracaderms (Jawless Fish) from West of England, Early Devonian. Above, two Pteraspis Rostrata, Below, one Hemicyclaspis Murchisovi. The Devonian was a geologic period