The common Atlantic marginella, Prunum apicinum, is conical with a smooth, short spire and three to four whorls (Andrews 1994; Abbot & Morris 1995). The aperture is long and narrow with a thick outer lip that is notched at the base, and a columella with four distinct folds. Shell color varies from highly polished cream or yellow to grayish tan with a white outer lip bearing reddish brown spots.