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.
- Abbott, RT & PA Morris. 1995. Shells of the Atlantic and Gulf Coasts and the West Indies, 4th Edition. Houghton Mifflin. New York, NY. USA. 350 pp.
- Andrews, J. 1994. A Field Guide to Shells of the Florida Coast. Gulf Publishing. Houston, TX. USA. 182 pp.
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