Conus janus, common name the janus cone, is a species of sea snail, a marine gastropod mollusk in the family Conidae, the cone snails and their allies.Like all species within the genus Conus, these snails are predatory and venomous. They can "sting" humans if handled.
The size of the shell varies between 37 mm and 80 mm. The maculated spire is concavely elevated and striate. The narrow body whorl narrow has a rounded shoulder, and is distantly sulcate below. The shell is whitish or yellowish, indistinctly three-banded by yellowish brown or chestnut longitudinal markings.[1]
This marine species occurs in the Mascarene Basin; off Southeast India and the Philippines.