how can you tell if there’s a mollusk inside a shell? Conchs are mollusks, marine snails that build elaborate shells as a home and a form of protection from predators. The spiral shape is created by the gradual expansion of the shell as the animal grows. There are no living cells in a shell such as blood vessels and nerves. This means that a creature with a seashell can not feel anything that hits the shell. Inside a living conch shell is a mollusk, or soft-bodied sea snail. Conchs get around by