Image: Protocaris marshi
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Description: Illustration of Protocaris marshi
Title: Protocaris marshi
Credit: Charles Doolittle Walcott (1886) Second contribution to the studies on the Cambrian faunas of North America, 30 of Geological Survey bulletin issue =30 of Bulletin, Geological Survey (U.S.)., Govt. Print. Off.,, pp. 369
Author: C.D. Walcott
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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