Plate 24: Middle Cambrian Crustaceans (Neolenus, Ptychoparia, Mollisonia, and Tontoia) 1. Neolenus serratus (Rominger) = 1a. Neolenus serratus (Rominger) = 2. Ptychoparia cordilleræ (Rominger) = 3. Mollisonia symmetrica Walcott = 4. Tontoia kwaguntensis Walcott = 5. Mollisonia gracilis Walcott = 6. Mollisonia  rara Walcott = 7. Mollisonia  rara Walcott = . 1912 67 Walcott Cambrian Geology and Paleontology II plate 24

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