• Nautilus is commonly called pearly nautilus.

• Body is enclosed in a calcareous spirally coiled many chambered shell. The shell is about 25cm in diameter.

• The texture of the shell is porcelain-like white, the outer surface is brown with dark bands and the inner lining is pearly white.

• The animal occupies the outermost and largest chamber into which body can be withdrawn for protection.

• The chambers are separated by a system of septa.