Conus olgiatii  Conus olgiatii is a species of sea snail, a marine gastropod mollusc in the family Conidae, the cone snails and their allies. Like all species within the genus "Conus", these snails are predatory and venomous. They are capable of "stinging" humans, therefore live ones should be handled carefully or not at all. The size of the shell varies between 30 mm and 37 mm. This marine species occurs off Madagascar.