Natural History Museum
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The Echinoid Directory

Protocidaris acuaria (Whidbourne, 1896); Drawing of type material, from Whidborne, 1896, as reproduced in Jackson, R. T. 1912. Phylogeny of the Echini, with a revision of Palaeozoic species Memoirs of the Boston Society of Natural History 7, 491 pp. 76 pls.

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