Halysites catenulatus Location: U.S. National Museum of Natural History, Washington, DC Year: 2008 Merckdigitals catalogue number: 22-53244 Comments: Silurian, KY

Halysites catenulatus (Detail of above) Location: U.S. National Museum of Natural History, Washington, DC Year: 2008 Merckdigitals catalogue number: 22-53244 Comments: Silurian, KY

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