Nautilus

Family of molluscs

A nautilus (from Latin nautilus 'sails like a vessel'; from Ancient Greek ναυτίλος (nautílos) 'seaman, sailor') is any of the various species within the cephalopod family Nautilidae. This is the sole extant family of the superfamily Nautilaceae, suborder Nautilina, order Nautilida, and subclass Nautiloidea. It comprises nine living species in two genera, the type of which is the genus Nautilus.

From Wikipedia, under CC BY-SA. More on occurri.