Echinoidea name details
original description
Girard, C.F. (1850). Observations upon Planarian Worms, with descriptions of several new species of Echinoderms. <em>Proceedings of the Boston Society of Natural History 1848-1851.</em> 3: 363–368. Erratum on p. 396., available online at https://www.biodiversitylibrary.org/page/8870665 [details]
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