Simnia arcuataSimnia arcuata, common name Vidler's simnia, is a species of sea snail, a marine gastropod mollusk in the family Ovulidae, the ovulids, cowry allies or false cowries.DescriptionThe size of an adult shell varies between 8 mm and 26 mm.DistributionThis species occurs in the Pacific Ocean off the Galapagos Islands and from California to Peru.