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They are often scattered through the beds singly, and may be useful to a geologist in determining the age of the rock. Palaeoniscus comptus, Agassiz. Scale, magnified. Palaeoniscus elegans, Sedgwick. Under surface of scale, magnified. Palaeoniscus glaphyrus, Agassiz. Under surface of scale, magnified. Coelacanthus granulatus, Agassiz. Granulated surface of scale, magnified.
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