A Monograph of the Trilobites of North America: with Coloured Models of the Species — Isotelus Cyclops.[39] Green. Cast No. 24. Fig. 7.

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A Monograph of the Trilobites of North America: with Coloured Models of the Species Isotelus Cyclops.[39] Green. Cast No. 24. Fig. 7. · ch 40/57

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