Many olive shells feed by traveling just under the surface of sand in their bullet-shaped shells. Many cone species burrow in sand for protection, with the pointed end of their shell forging the way. Next Question 8. A snail s periostacum is a coating that often hides a beautiful shell underneath. A snail s periscope is usually called a siphon.
Snails generally use smell, sight and feel to find food.
Next Question 7. Bivalves don t have any teeth, at least not teeth to chew or bite with. Most bivalves eat by filtering microscopic plants and animals from the water. Most gastropods and cephalopods have teeth called radula that they rasp over food as the first stage of digestion. Next Question 6.