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Keywords from Image Description:
Walcott Cambrian Geology and Paleontology II plate . Plate Middle Cambrian Crustaceans Carnarvonia and Tuzoia Carnarvonia venosa Walcott Walcott Walcott Walcott Charles Walcott Middle Cambrian Branchiopoda Malacostraca Trilobita and Merostomata Smithsonian Miscellaneous Collections Volume Number Publication City of Washington