Plate 2: Middle Cambrian Merostomata (Sidneyia) 1. Sidneyia inexpectans (Walcott) = 2. Sidneyia inexpectans (Walcott) = 3. Sidneyia inexpectans (Walcott) = 4. Sidneyia inexpectans (Walcott) = . 1911 67 Walcott Cambrian Geology and Paleontology II plate 03

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