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References
REFERENCES
Jackson, R. T., 1912. Phylogeny of the Echini, with a Revision of Paleozoic species. Mem. Boston Soc. Nat. Hist., vii.Google Scholar
Kier, P. M., 1956. New Genus of Echinoid from the Palaeozoic of Ireland. Geol. Mag., xciii, 15–17.CrossRefGoogle Scholar