Sipho parvus Verrill & S. Smith, 1882 Mohnia parva is a species of sea snail, a marine gastropod mollusk in the family Buccinidae, which are the true whelks.

It contains a rather slender, acute spire; a short, straight siphonal canal; and a few raised, strong, revolving cinguli.

It has six to seven convex whorls, usually with three (rarely five or six) prominent, rounded cinguli, or carinae, separated by much wider, broadly concave interspaces.

The uppermost one is usually some distance below the suture, and is often stronger than the rest, producing a slight shoulder.

The thin outer lip is rounded, incurved at the base of the siphonal canal, which is narrow, but very short, and straight.