Plate 27: Middle Cambrian Crustaceans (Burgessia, Waptia, and Opabinia) 1. Burgessia bella Walcott = 2. Burgessia bella Walcott = 3. Burgessia bella Walcott = 4. Waptia fieldensis Walcott = 5. Waptia fieldensis Walcott = 6. Opabinia regalis Walcott = . 1912 67 Walcott Cambrian Geology and Paleontology II plate 27

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