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Updated: May 8, 2025
The other, Archaeocidaris, represents, in like manner, the Cidaris of the present seas. Productus semireticulatus, Martin, sp. Spirifera trigonalis, Martin, sp. Mountain Limestone. Spirifera glabra, Martin, sp. The British Carboniferous mollusca enumerated by Mr. Etheridge comprise 653 species referable to 86 genera, occurring chiefly in the Mountain Limestone.
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