Note the eye at the base of the tentacle. In most land snails the eyes are at the tip of the tentacle e.g. my post “A snail and its eyes” (iSpot 27/06/2012)
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I have been trying to capture images of snails' eyes; the latter being a feature shared with humans, this might just increase human -> snail empathy. I have yet to apply this idea to slugs.
Lat/Lng: 51.4337, -2.7624
OS grid ref: ST470707