Nassarius arcularia, common name : the casket nassa or the little box dog whelk, is a species of sea snail, a marine gastropod mollusk in the family Nassariidae, the Nassa mud snails or dog whelks. There are two subspecies : \n* Nassarius arcularia arcularia (Linnaeus, 1758): accepted as Nassarius arcularia. \n* Nassarius arcularia plicatus (Röding, 1798)Subspecies brought into synonymy \n* Nassarius arcularius arcularius (Linnaeus, 1758) accepted as Nassarius arcularia arcularia (Linnaeus, 1758)