Plate 31: Middle Cambrian Crustaceans (Hymenocaris, Fieldia, and Hurdia) 1. Hymenocaris obliqua Walcott = 2. Hymenocaris obliqua Walcott = 3. Hymenocaris obliqua Walcott = 4. Hymenocaris circularis Walcott = 5. Hymenocaris ovalis Walcott = 6. Hymenocaris ovalis Walcott = 7. Hymenocaris parva Walcott = Tuzoia parva (Walcott, 1912) 8. Fieldia lanceolata Walcott = 9. Hurdia victoria Walcott = Hurdia victoria Walcott, 1912 . 1912 67 Walcott Cambrian Geology and Paleontology II plate 32

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