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Young Common Hermit Crab (Eupagurus bernhardus) moving into empty shell of Edible Periwinkle. Europe Young Common Hermit Crab (Eupagurus bernhardus) in Flat Periwinkle shell, examining empty shell of Edible Periwinkle, before changing shells. Europe Ammonite. Slate rock with limpets and barnacles. County Clare, Ireland Slate rock with limpets. County Clare, Ireland Tropical sea slug (Chromodoris). Tropical seas Small white sea slug (family Aeolididae). Atlantic coasts Common Grey Sea Slug (Aeolidia papillosa) group spawning on a rock in a tide pool. Atlantic coasts Sea Slug (Facelina auriculata) thrashing its cerata in defensive display. Atlantic coasts Sea Lemon (Archidoris pseudoargus). Atlantic coasts Sea Hare (Aplysia punctata) group spawning among seaweed. Atlantic coasts Sea slug (unidentified). Pacific coast of North America. Ruffed or Lettuce Sea Slug (Eysia crispata). Tropical seas. Blue-spotted Sea Slug (family Aplysiidae) on dead coral. Tropical seas. Garden Snails (Helix aspersa) hibernating in a sheltered alcove beneath a log. Limpets on a cracked rock. Limpet on crazed rock. Limpets and barnacles on crazed rock. Garden Snail (Helix aspersa). Topshells and other marine snails with mother-of-pearl layer exposed, some as a result of wave action. Ramshorn Snail (Planorbis species) very young specimens. Great Grey Slug (Limax maximus) egg development series No 8 of 8. Europe Great Grey Slug (Limax maximus) hatching from egg. Europe Great Grey Slug (Limax maximus) hatchling. Europe Queen Scallop (Chlamys opercularis) showing rudimentary eyes. Atlantic Queen Scallop (Chlamys opercularis) showing rudimentary eyes. Atlantic Roman Snail (Helix pomatia) hatchlings. Europe White-lipped Banded Snail (Cepaea hortensis). White-lipped Banded Snail (Cepaea hortensis). Pattern of slime trails left on a wall by Common or Garden Snails (Helix aspersa). One snail still heading for home. Europe Garden Snail (Helix aspersa) walking on glass. Ammonite. Grey Sea Slug (Aeolidia papillosa). Atlantic coasts Garden Snails (Helix aspersa) hibernating in a sheltered alcove beneath a log. Europe Slipper Limpet (Crepidula fornicata) shells with hiding crab on a sandy beach. Atlantic coasts Sea Hare (Aplysia punctata). Atlantic coasts Garden Snail (Helix aspersa). Europe Roman Snail (Helix pomatia) shell seen by transmitted light. Europe Roman Snail (Helix pomatia) shell sectioned to show internal structure. Europe Garden Snail (Helix aspersa). Queen Scallop (Chlamys opercularis) showing ocelli or simple eyes. Banana Slug (Ariolimax columbianus). British Columbia, Canada Great Grey Slug (Limax maximus). Tree snails (unidentified). East Africa Garden Snail (Helix aspersa). Octopus (Octopus macropus). White-lipped Snail (Cepaea hortensis). White-lipped Snail (Cepaea hortensis). Octopus (Octopus macropus). Octopus (Octopus macropus). N. E. Atlantic to W. Pacific Chambered or Pearly Nautilus (Nautilus pompilius) shells. Indo-Pacific Chambered or Pearly Nautilus (Nautilus pompilius) shells. Indo-Pacific Caribbean Reef Squid (Sepioteuthis sepioidea). Mark, aged 10, watching a snail crawl up an umbellifer stem. Pattern of polished ammonite. Pattern of polished ammonite. Pattern of sectioned ammonite. Ammonite. Cardiid Cockle (Fragum eragatum) shells. Western Australia Shell Beach. A beach made entirely from Cardiid Cockle (Fragum eragatum) shells. Western Australia Ammonite. Two kittens in a trug basket with snails and fruit. Silver kitten and snail.