Kylix halocydne is a species of sea snail, a marine gastropod mollusk in the family Drilliidae that lives in a tropical climate, usually in the Eastern Pacific area.

The suture is strongly appressed with a smooth narrow band in front of it and behind the somewhat constricted fasciole Other spiral sculpture consists of sharply incised lines, four or five on the spire between the sutures, equal and with wider equal rounded interspaces, and about 24 on the body whorl.

The interspaces become more cord-like near the siphonal canal and sometimes feebly nodulous where the lines cut the ribs.

The axial sculpture consists of (on the penultimate whorl about 18) feeble narrow ribs, stronger near the apex, obsolete on the body whorl, with wider interspaces, beginning in front of the fasciole, hardly reaching the base, and protractively oblique.

The inner lip shows a thin layer of brownish enamel, the edge raised anteriorly.