Bulla is a genus of medium to large hermaphrodite sea snails, shelled marine opisthobranch gastropod molluscs. These herbivorous snails are in the suborder Cephalaspidea, headshield slugs, and the order Opisthobranchia.
Tiberia is a genus of minute parasitic sea snails, marine gastropod molluscs in the family Pyramidellidae, the pyrams and their allies. Tiberia is the only genus in the tribe Tiberiini.
Trochus is a genus of medium-to large-sized, top-shaped sea snails with an operculum, of the family Trochidae, the top snails.
Gibbula is a genus of small sea snails, marine gastropod molluscs in the subfamily Cantharidinae of the family Trochidae, the top snails.
Pinna is a genus of bivalve molluscs belonging to the family Pinnidae.
Vasum, common name the vase snails or vase shells, is a genus of mostly rather large predatory sea snails, marine gastropod mollusks in the subfamily Vasinae within the family Turbinellidae.
Patella is a genus of sea snails with gills, typical true limpets, marine gastropod mollusks in the family Patellidae, the true limpets.
Purpura is a genus of sea snails, marine gastropod mollusks in the subfamily Rapaninae of the family Muricidae, the murex snails or rock snails.
Jujubinus striatus, common name the grooved top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Jujubinus is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails.
Capulus is a genus of small sea snails, marine gastropod mollusks in the family Capulidae, the cap 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.
Distorsio is a genus of medium-sized sea snails, marine gastropod mollusks in the family Personidae, the Distortio snails.
Galeodea is a genus of large sea snails, marine gastropod mollusks in the subfamily Cassinae of the family Cassidae.
Casmaria, is a genus of medium-sized sea snails, marine gastropod molluscs in the subfamily Phaliinae of the family Cassidae, the helmet shells and their allies.
Around 65 species of crab occur in the waters of the British Isles. All are marine, with the exception of the introduced Chinese mitten crab, Eriocheir sinensis, which occurs in fresh and brackish water. They range in size from the deep-water species Paromola cuvieri, which can reach a claw span of 1.2 metres, to the pea crab, which is only 4 mm (0.16 in) wide and lives inside mussel shells.
Tritia neritea is a species of sea snail, a marine gastropod mollusk in the family Nassariidae, the Nassa mud snails or dog whelks.
Polititapes is a genus of marine bivalve molluscs in the subfamily Tapetinae of the family Veneridae, commonly known as carpet shells.
