Plate 6: Middle Cambrian Trilobita and Merostomata (Neolenus and Sidneyia) 1. Neolenus serratus (Rominger) = 2. Neolenus serratus (Rominger) = 3. Sidneyia inexpectans (Walcott) = . 1911 67 Walcott Cambrian Geology and Paleontology II plate 06

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