Plate 18: Middle Cambrian Annulata (Miskoia) 1. Miskoia preciosa Walcott = 2. Miskoia preciosa Walcott = 3. Miskoia preciosa Walcott = 4. Miskoia preciosa Walcott = 5. Miskoia preciosa Walcott = . 1911 67 Walcott Cambrian Geology and Paleontology II plate 18

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