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Keywords from Image Description:
FMIB Calveria hystrix Wyvilll Thomson.jpeg Calveria hystrix Wyvilll Thomson Subject Sea urchins Calveria Tag Invertebrates 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 Jeffreys