The new genus Scoloconcha (type, Productus indianensis Hall) is from the Salem Limestone of Indiana. The new genus Platyselma (type, P. echinatum, n. sp., from Oklahoma) contains the new species P. simplex (Missouri and Kentucky) and P. quapawense (Oklahoma). The new genus Crossacanthia (type, C. perlamellosa from Missouri and Kentucky) contains the new species C. macknighti from Oklahoma.

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