Cinysca bicarinata is a species of sea snail, a marine gastropod mollusk in the family Areneidae.

It is yellowish-white and uniform in color, sculpted with two elevated spiral keels, otherwise smooth.

The underside is slightly concave, with two spiral ridges and a relatively large, angular umbilicus.

The aperture is oblique and circular, with the peristome slightly expanded and adorned with outward-extending keels and ridges.

[2] This marine species occurs off the Agulhas Bank, South Africa.