Plate 28: Middle Cambrian Crustaceans (Opabinia, Nathorstia, and Naraoia) 1. Opabinia regalis Walcott = Opabinia regalis Walcott, 1912 2. Nathorstia transitans Walcott = Olenoides serratus (Rominger, 1887) 3. Naraoia compacta Walcott = Naraoia compacta Walcott, 1912 4. Naraoia compacta Walcott = Naraoia compacta Walcott, 1912 . 1912 67 Walcott Cambrian Geology and Paleontology II plate 28

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