Plate 5: Middle Cambrian Merostomata (Sidneyia and Amiella) 1. Sidneyia inexpectans (Walcott) = 2. Sidneyia inexpectans (Walcott) = 3. Sidneyia inexpectans (Walcott) = 4. Amiella ornata (Walcott) = Hurdia victoria (Walcott, 1912) . 1911 65 Walcott Cambrian Geology and Paleontology II plate 05

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