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The modern Pearly Nautilus; the animal occupies the living chamber of the sectioned shell.

Chambered Nautilus

The modern Pearly Nautilus; the animal occupies the living chamber of the sectioned shell.

"Pearly Nautilus. e, eye; h, hood, a muscular portion of the foot which protects the softer parts; s, siphon; se, septa, separating the successive chambers of the shell; sp, siphuncle; t, tentacles." — Galloway

Pearly Nautilus

"Pearly Nautilus. e, eye; h, hood, a muscular portion of the foot which protects the softer parts; s,…

"Pearly nautilus with half the shell removed." —Davison, 1906

Pearly Nautilus

"Pearly nautilus with half the shell removed." —Davison, 1906