Archie Lamont; Further remarks on Platycalymene and the segmental relations of trilobite eyes. Geological Magazine ; 88 (4): 295–296. doi:
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The specimen referred to by Stubblefield as indistinguishable from Platycalymene duplicata (Murchison) is from the Raheen shales of Passage East, County Waterford, southeastern Ireland.
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