A lectotype of Phylloceras onoense Stanton, the type species of the genus Hypophylloceras, is here selected from the 2 original specimens of Ammonites ramosus Gabb (not Meek) on which Stanton in part originally based his species. Gabb's 2 specimens are not conspecific, and a possible new species of Hypophylloceras is suggested for the second specimen.

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