Mollusca


 * &mdash;An ancient lineage of molluscs with cap-like shells
 * † &mdash; fossils; probable ancestors of bivalves
 * † &mdash; fossils; snail-like organisms such as 
 * &mdash; All the s and s including, s, , s, s,
 * &mdash; s, s, s, s, s
 * &mdash; chitons
 * a &mdash;, , , ,
 * &mdash; tusk shells
 * &mdash; worm-like organisms
 * &mdash;An ancient lineage of molluscs with cap-like shells
 * † &mdash; fossils; probable ancestors of bivalves
 * † &mdash; fossils; snail-like organisms such as 
 * &mdash; All the s and s including, s, , s, s,
 * &mdash; s, s, s, s, s
 * &mdash; chitons
 * a &mdash;, , , ,
 * &mdash; tusk shells
 * &mdash; worm-like organisms