A seashell or sea shell, also known simply as a shell, is a hard, protective outer layer usually created by an animal or organism that lives in the sea. The shell is part of the body of the animal. Empty seashells are often found washed up on beaches by beachcombers. The shells are empty because the animal has died and the soft parts have decomposed or been eaten by another animal.
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.
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, common name the helmet shells, is a genus of very large sea snails, marine gastropod mollusks in the family Cassidae, the helmet shells and their allies. This is the type genus of the subfamily Cassinae.
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.
Cypraecassis is a genus of medium-sized to large sea snails, marine gastropod molluscs in the family Cassidae.
Chicoreus ramosus, common name the ramose murex or branched murex, is a species of predatory sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails. It is considered an economically important species in the Indo-West Pacific, especially in India.
Conus mozambicus, common name the Mozambique cone or the elongate cone, is a species of medium-sized sea snail, a predatory marine gastropod mollusc in the family Conidae, the cone snails or cone shells.
Clavatula taxea, common name the yew turrid, is a species of sea snail, a marine gastropod mollusk in the family Clavatulidae.
Toxiclionella tumida is a species of sea snail, a marine gastropod mollusk in the family Clavatulidae.
Turris garnonsii, common name Garnons' pleurotoma, is a species of sea snail, a marine gastropod mollusk in the family Turridae, the turrids.
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.
Oliva panniculata, common name the silk-clad olive, is a species of sea snail, a marine gastropod mollusk in the family Olividae, the olives.
Clanculus miniatus, common name the keeled top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Oxystele tigrina, common name the tiger top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Neverita didyma, common name the bladder moon snail or moon shell, is a species of predatory sea snail, a marine gastropod mollusc in the family Naticidae, the moon snails.
Cypraecassis testiculus, common name the reticulated cowry helmet, is a species of large sea snail, a marine gastropod mollusk in the family Cassidae, the helmet snails and bonnet snails.
Phalium glaucum, common name the grey bonnet or glaucus bonnet, is a species of large sea snail, a marine gastropod mollusk in the family Cassidae, the helmet snails and bonnet snails.
