Cymatosyrinx ebur Dall, 1927 (original combination) Lissodrillia ebur is a species of sea snail, a marine gastropod mollusk in the family Drilliidae.

The suture is distinct, not appressed, with a slightly constricted fasciole in front of it.

The axial sculpture consists of (on the body whorl 10-11) rounded fiexuous smooth ribs, most prominent at the periphery on the spire, sigmoidly flexed on the body whorl and absent from the base; the interspaces are equal or wider than the ribs.

The outer lip is very prominently protractively arcuate.

[2] This species occurs in the Atlantic Ocean off Florida, Georgia and South Carolina, United States, and in the Caribbean Sea off Cuba.