A Monograph of the Trilobites of North America: with Coloured Models of the Species — Trimerus Delphinocephalus. Green. Cast No. 32, and Fig. 1.

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A Monograph of the Trilobites of North America: with Coloured Models of the Species Trimerus Delphinocephalus. Green. Cast No. 32, and Fig. 1. · ch 48/57

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