Abstract

A zone containing fairly abundant specimens of Hypseloconus (Monoplacophora) is recorded from the Potosi Formation of Missouri. Potosi specimens of Hypseloconus are identical to the problematical form Shelbyoceras bessemerense Ulrich, Foerste and Miller, 1943, from the Copper Ridge Dolomite of Alabama, and S. cf. S. bessemerense from the Potosi Formation of Missouri. These forms are here referred to the Monoplacophora as Hypseloconus bessemerense. Another species of Shelbyoceras, S. buttsi Ulrich, Foerste and Miller, 1943, is considered a synonym of Hypseloconus bessemerense. These forms originally described as Shelbyoceras lack characteristics of cephaloopods.

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