Here is an image of a Silurian Period of a Lichas boltoni (Bigsby, 1825) [it is now known by genus Arctinurus (Castelnau, 1843)]. This illustration was originally in an 1852 James Hall publication of a fossil found in the Rochester Shale of New York.
This image was scanned from plate 17 of Guide to the Geology and Paleontology of Niagara Falls and Vicinity by Amadeus W. Grabau April 1901.
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