Montfortista excentricaMontfortista excentrica is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets and slit limpets.DescriptionThe size of the shell typically varies between six and eighteen millimetres.DistributionThis marine species occurs in the Central Indo-West Pacific; off Queensland, Northern Territory, Western Australia, Gulf of Carpentaria, Australia.