Image: Walcott Cambrian Geology and Paleontology II plate 13

Description: 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 =
Title: Walcott Cambrian Geology and Paleontology II plate 13
Credit: Charles D. Walcott: Middle Cambrian Holothurians and Medusae. Smithsonian Miscellaneous Collections Volume 57, Number 3 (Publication 2011). City of Washington. Published by the Smithsonian Institution. June 13, 1911.
Author: Charles Doolittle Walcott
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