The Echinoid Directory

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Perischodomus biserials M'Coy, 1849; Trinity College Dublin.  Lower Carboniferous, Hook Head, Ireland. Interal view of the oral surface. From 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 (pl. 62, fig. 6)

Diameter of test ca. 50 mm.