 Sometimes the single genus in this subfamily is simply left in the larger family Marginellidae.Shell minute to small, white, hyaline; last whorl rapidly expanded then lip abruptly swept posteriorly giving characteristic shape; spire flat to low; lip thickened posteriorly, smooth, lacking lirae or denticulation, external varix absent; siphonal notch absent; posterior notch absent; columella multiplicate with combined total of 3-8 plications plus parietal lirae; internal whorls cystiscid type.Animal tentacles and siphon are moderately long.