<p><span style="font-size: 13.008px;"><strong>Fig. 3.67.</strong> The nautilus (<em>Nautilus</em> spp.) has geometric chambers it uses for buoyancy, as shown in this shell that has been cut in half.</span></p>

Fig. 3.67. The nautilus (Nautilus spp.) has geometric chambers it uses for buoyancy, as shown in this shell that has been cut in half.

Image courtesy of Chris73, Wikimedia Commons