Marginella
/mɑːdʒɪˈnɛlə/(also Marginellas)
noun
A genus of marine gastropod molluscs; (also marginella) a mollusc of this genus or of the family Marginellidae; the shell of any of these molluscs, usually glossy with a small or flattened spire and a thickened outer lip.
Origin
Early 19th century. From scientific Latin Marginella, genus name, probably from classical Latin margin-, margō + -ella.