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Keywords from Image Description:
Walcott Cambrian Geology and Paleontology II plate . Plate Cambrian and preCambrian Merostomata Sidneyia and Beltina Sidneyia inexpectans Walcott Walcott Walcott Walcott Walcott Charles Walcott Middle Cambrian Merostomata Smithsonian Miscellaneous Collections Volume Number Publication City of Washington Published by the