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Page:Pennsylvanian invertebrates of the Mazon Creek Area, Illinois Eurypterida.djvu/22

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Fig. 49. A particularly well-preserved and only partly compressed specimen of Adelophthalmus mazonensis (Meek and Worthen) from the Herdina collection (H-3); × 1.8. The ocellar mound and the short genal spines of the carapace are particularly well preserved.

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