A Monograph of the Trilobites of North America: with Coloured Models of the Species — Calymene Diops.[19] Green. Cast No. 8, and fig. 2.

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A Monograph of the Trilobites of North America: with Coloured Models of the Species Calymene Diops.[19] Green. Cast No. 8, and fig. 2. · ch 22/57

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