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FMIB Porocidaris purpurata Wyville Thomson.jpeg Porocidaris purpurata Wyville Thomson Subject Sea urchins Porocidaris Tag Shellfish Cite book Depths of the Sea an account of the General Results of the Dredging Cruises of SS 'Porcupine' and 'Lightning' During the Summers of and under the Scientific Direction of Dr Carpenter Gwyn