Triphora bicolor (Pease, 1868). (Synonyms: Triphoris alternata Pease, 1861, non C. B. Adams, 1852; Mastonia harperi Jousseaume, 1884.) Length, 7.5 mm; diameter, 2 mm. Shell: conic-inflated; last whorl with three beaded spiral threads; apical and abapical spirals yellow, middle row brown. Spire: protoconch acuminate, of four light brown whorls, the apical smooth, the others carinated with two spiral keels overrun by axial threads; teleoconch of eight inflated whorls; suture wide, shallow. Sculpture: three beaded spirals on each whorl, the apical row with large circular, close-set beads, the abapical row with hemispherical bosses and axial columns, middle row with smaller beads; base with two smooth or obsoletely beaded spirals. Aperture: anterior canal short, recurved; posterior canal a narrow slit. Color: apical spiral yellow, abapical yellow-brown, middle row and suture dark brown; apical whorls white. These triphorids are common in tide pools and in shallow water on fringing reefs. T. bicolor was described from the Hawaiian Islands.