Platyceras arkonensis (Shimer&Grabau 1902) spine.
By Ludwigia
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In the middle of the hash plate amongst Tentaculida and Crinoid bits. 12mm. long. You can see where the spines were attached. From Hungry Hollow, On., Canada. Middle Devon, Givet, Arkona Formation.
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Gastropods and Bivalves Worldwide
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