Plate 2: Middle Cambrian Merostomata (Sidneyia) 1. Sidneyia inexpectans (Walcott) = Hurdia victoria (Walcott, 1912) 2. Sidneyia inexpectans (Walcott) = Hurdia victoria (Walcott, 1912) 3. Sidneyia inexpectans (Walcott) = Hurdia victoria (Walcott, 1912) 4. Sidneyia inexpectans (Walcott) = Hurdia victoria (Walcott, 1912) . 1911 63 Walcott Cambrian Geology and Paleontology II plate 04

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