Plate 30: Middle Cambrian Crustaceans (Bidentia, Emeraldella, and Burgessia) 1. Bidentia difficilis Walcott = 2. Emeraldella brocki Walcott = 3. Burgessia bella Walcott = 4. Burgessia bella Walcott = . 1912 69 Walcott Cambrian Geology and Paleontology II plate 30

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