original description(ofPerischoechinoidea †)M'Coy, F. (1849). On some new Paleozoic Echinodermata. <em>The Annals and Magazine of Natural History, Series 2.</em> 3: 244-254., available online athttps://biodiversitylibrary.org/page/16085535 page(s): 251; note: first mentioned under the name Perischoechinida [details]