Sh"ells, Pelican's-foot, [742]
Sh"ells, Scorpion-, [743]
Sh"ells, Top-, [741]
Sh"ells, Trumpet-, [742]
Slugs, Sea-, Naked-gilled, [742]
Sl"gs, Shell-less, [740]
Snails, Fresh-water, [740]
Sn"ils, Garden-, [740]
Sn"ils, Land- or Agate-, [740]
Sn"ils, Sea-, Tongue of, [742]