Patterns of tubercles on a sea urchin: The Heart Urchin known as the Sea Potato, Echinocardium cordatum (Pennant), empty test or shell without spines, lower surface view (4)
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Patterns of tubercles on a sea urchin: The Heart Urchin known as the Sea Potato, Echinocardium cordatum (Pennant), empty test or shell without spines, lower surface view (4)