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Shells of Calliostoma bullisi and Calliostoma hassler. 10–12 Calliostoma bullisi holotye NMNH 612702, frontal, apical and umbilical views, length = 24.2 mm, courtesy of NMNH 13–15 Calliostoma hassler, MZSP 49814, frontal, apical and umbilical views, length =34 mm.
