Plate 19: Middle Cambrian Annulata (Ottoia, Hyolithes, and Selkirkia) 1. Ottoia prolifica Walcott = 2. Ottoia prolifica Walcott = 3. Ottoia prolifica Walcott = 4. Ottoia prolifica Walcott = 5. Ottoia prolifica Walcott = 6. Selkirkia major (Walcott) = 7. Hyolithes carinatus Matthew = 8. Selkirkia fragilis (Walcott) = 9. Selkirkia gracilis (Walcott) = . 1911 69 Walcott Cambrian Geology and Paleontology II plate 19

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