MOLLUSCS
Periwinkles-(Family-Littorinidae)
(Subfamily- Littorininae (periwinkles))
Edible periwinkle, Littorina littorea
Rough periwinkles, Littorina saxatilis complex of species
Flat periwinkles, Littorina obtusata and L. mariae
Small periwinkle, Melaraphe neritoides
(Subfamily-Lacunidae (Chink shells))
Chink shell, Lacuna pallidula
Topshells- (Family-Trochidae)
Flat (purple) Top shell, Gibbula umbilicalis
Grey Top shell, Gibbula cineraria
Thick top shell, Monodonta lineata
Painted top shell, Calliostoma zizyphinum
Periwinkles vs. Topshells, telling them apart
Limpets-(Family-Patellidae)
Common limpet, Patella vulgata
Black-footed limpet, Patella depressa
Blue rayed limpet, Helcion pellucidum (formerly Patina pellucida)
Family Rissoidea
Rissoa parva
Cingula trifasciata
Family Calyptraeidae
Slipper limpet, Crepidula fornicata
Family Muricidae, Whelks
Buckie, Buccinum undatum
Thick-lipped dog whelk, Hinia incrassata
Chitons-(Class-Polyplacophora)
Family Mytilidae (Mussels)