Plate 13: Middle Cambrian Holothurians (Laggania, Mackenzia, and Louisella) 1. Laggania cambria Walcott = 2. Mackenzia costalis Walcott = 3. Mackenzia costalis Walcott = 4. Louisella pedunculata Walcott = . 1911 67 Walcott Cambrian Geology and Paleontology II plate 13

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