Octopuses and squids have evolved to intelligent mobile forms with complex behaviour. The commonest and most widespread chiton found on British rocky shores is Lepidochitona cinerea . On many shores it is the only species to be found. It is in this class of animals that the typical spiral snail-like molluscs are classified. However, unlike land snails , the marine ones breathe through gills to obtain oxygen from sea water.
Gastropods have a feeding organ called a radula.
Most of this taxa contain a spirally-coiled shell and a prominent foot on which it crawls around. The foot can usually be retracted in the shell. The opening is called the aperture. They breathe through gills. It measures 222 mm total length.