Pacific Northwest Gardening: Apropos of Nothing v.14, 1 by mauryhillfarm

mauryhillfarm wrote:
Kind of leathery, but not really very flexible, as they will tear more easily than leather. I think the snails exude a substance that glues the eggs and sand into a curved strip. Very weird looking!

I tried to link in a video clip of one pulling its body back into the shell, but it wouldn't transfer. So here is a photo of the snail fully enclosed, with its little trap door over the opening. If you care to know, it is called the operculum and is sort of a fingernail-like material.