The Cassidae are a taxonomic family of medium-sized, large, and sometimes very large sea snails commonly called helmet snails or bonnet snails. These are marine gastropod mollusks in the superfamily Tonnoidea and the clade Littorinimorpha.
Tonna perdix, common name the partridge tun, is a species of very large sea snail, a marine gastropod mollusc in the family Tonnidae, the tun shells.
Phalium areola, common name the checkerboard bonnet, is a species of sea snail, a marine gastropod mollusc in the subfamily Cassinae, within the family Cassidae the helmet and bonnet shells. It is also known as the checkerboard bonnet shell.
Cassis cornuta, common name the horned helmet, is a species of extremely large sea snail, a marine gastropod mollusc in the family Cassidae, the helmet shells and their allies.
Gemmula rosario is a species of sea snail, a marine gastropod mollusk in the family Turridae, the turrids.
Pollia undosa, common name : the waved goblet, is a species of sea snail, a marine gastropod mollusk in the family Pisaniidae, the true whelks.
Clivipollia incarnata is a species of sea snail, a marine gastropod mollusk in the family Prodotiidae.
Fusinus colus, common name the Distaff spindle or Long-tailed Spindle, is a species of sea snail, a marine gastropod mollusk in the family Fasciolariidae, the spindle snails, the tulip snails and their allies.
Aptyxis syracusana, common name Syracusan spindle shell, is a species of sea snail, a marine gastropod mollusc in the family Fasciolariidae, the spindle snails, the tulip snails and their allies.
Scutus unguis, common name the northern duck's bill, is a species of large sea snail or limpet, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets and slit limpets.
Rapa rapa, common name the bubble turnip, is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.
Nerita albicilla, common name the blotched nerite, is a species of sea snail, a marine gastropod mollusk in the family Neritidae.
Nerita undata is a species of sea snail, a marine gastropod mollusk in the family Neritidae.
Planaxis sulcatus, common name the tropical periwinkle, is a species of sea snail, a marine gastropod mollusk in the family Planaxidae.
Casmaria erinaceus, common name : the common bonnet, is a species of large sea snail, a marine gastropod mollusk in the family Cassidae, the helmet snails and bonnet snails.
Casmaria ponderosa, common name the heavy bonnet, is a species of large sea snail, a marine gastropod mollusk in the family Cassidae, the helmet snails and bonnet snails.
Galeodea echinophora, the spiny bonnet or helmet shell, is a species of large sea snail, a marine gastropod mollusk in the family Cassidae, the helmet snails and bonnet snails.
Phalium fimbria is a species of large sea snail, a marine gastropod mollusk in the family Cassidae, the helmet snails and bonnet snails.
Phalium, common name the bonnet shells, is a genus of large sea snails, marine gastropod molluscs in the subfamily Phaliinae of the family Cassidae, the helmet shells, bonnet shells and their allies.
Vexillum potieri is a species of sea snail, a marine gastropod mollusk, in the family Costellariidae, the ribbed miters.
