Semicassis saburonSemicassis saburon is a species of large sea snail, a marine gastropod mollusc in the family Cassidae, the helmet snails and bonnet snails.DescriptionThe shell of Semicassis saburon can reach a size of about.DistributionThis species is present in the Mediterranean Sea and the eastern Atlantic Ocean, from the Bay of Biscay south to Ghana, and west to the Azores, and the Canaries.