Conus guinaicus is a species of predatory sea snail, a marine gastropod mollusk. It is part of the genus Conus, more popularly known as cone snails, cone shells or cones.
The size of an adult shell varies between 21.6 mm and 60 mm. The inflated shell is rather thin. The spire and lower portion of the body whorl are striate. The color of the shell is chestnut or olivaceous, with usually two bands of irregular white cloudings, and scattered white spots. The aperture has a chocolate color, faintly white-banded in the middle.