Margarites frigidus Dall, 1919 Cantharidoscops frigidus, the polar margarite, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

The small, polished shell has a conic shape with pale flesh color.

It consists of six whorls, including a minute subglobular nucleus.

The axial sculpture shows faint incremental lines.

The axial sculpture consists of faint incremental lines.

The spiral sculpture consists of a few very faint lines near the umbilical region.