Heart Urchin Test with spines

Common British sea urchin: The empty test or shell of the Heart Urchin commonly known as the Sea Potato, Echinocardium cordatum (Pennant), from Whiteford Sands strandline, Gower, South Wales. Under surface with spines still attached

Sea urchin test with spines: The empty test or shell of the Heart Urchin commonly known as the Sea Potato, Echinocardium cordatum (Pennant), from Whiteford Sands strandline, Gower, South Wales. Under surface with spines still attached (1)

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