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Updated: June 29, 2025
A new genus of trilobite called Plutonia Sedgwickii, not yet figured and described, has been met with in the Harlech grits. It is comparable in size to the large Paradoxides Davidis before mentioned, has well-developed eyes, and is covered all over with tubercles.
Pygopterus mandibularis. Agassiz. Marl-slate. a. Outside of scale, magnified. b. Acrolepis Sedgwickii, Agassiz. Outside of scale, magnified. We are indebted to Messrs.
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