Schnecke No. nautilus_cut_11496.tif
by Alfred Pasieka - © Corbis. All Rights Reserved. - Science Photo Library
Sectioned shell of a nautilus
Nautilus shell. Close-up of a sectioned shell of a nautilus (Nautilus pompilius), showing the spiral structure and chambers of mother-of-pearl (nacreous). The nautilus is a marine cephalopod related to the squid, which inhabits the Indo- Pacific region.