Plate 21: Middle Cambrian Annulata (Wiwaxia, Banffia, and Pollingeria) 1. Wiwaxia corrugata (Matthew) = 2. Wiwaxia corrugata (Matthew) = 3. Wiwaxia corrugata (Matthew) = 4. Wiwaxia corrugata (Matthew) = 5. Banffia constricta Walcott = 6. Banffia constricta Walcott = 7. Pollingeria grandis Walcott = 8. Pollingeria grandis Walcott = 9. Pollingeria grandis Walcott = . 1911 67 Walcott Cambrian Geology and Paleontology II plate 21

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