Four trochoid marine snail shells. The exteriors are dull and range in color from white and beige to varying shades of brown. (21-555.1 has rust color bands.) Internally, the shells an iridescent white. The shells have six whorls, deep, well-defined sutures, and are covered with nodules and spiral raised lines. The periostracum has flaked off of some areas of the shells, revealing a slightly reflective and slightly iridescent material. The dextral shells have oval shaped apertures and open umbilici.