Cymatosyrinx fritillaria is a species of sea snail, a marine gastropod mollusk in the family Drilliidae.

The whorls in this species are only moderately rounded and distinctly angular at the shoulder.

The suture is distinct, appressed, coronated by the ends of the ribs in front,.

The axial sculpture consists of (on the body whorl about a dozen) narrow nearly straight ribs, with wider interspaces, strongest at the shoulder, obsolete on the base and toward the end of the body whorl.

The spiral sculpture consists of (on the body whorl about 14) obsolete, close set, hardly perceptible equal and equally distributed small threads covering the whorl in front of the shoulder.