Nautilus Shell

Nautilus Shell

The Nautilus shell is named after the Greek word for sailor.  Just think nautical.  

Sometimes Nautilus creatures are referred to as living fossils because they have barely evolved for millions of years.  The shell is their skelton or bony skin for their body.  In its live form, it adds a bigger room on to its shell body so that as it grows it can move into the bigger room or chamber.