cittamani: “ Scanned from Ward, P. In Search of Nautilus: Three centuries of scientific adventures in the deep Pacific to capture a prehistoric—living—fossil. New York: Simon and Schuster. ” The chambers of the shell, giving the animal its.
Nautiluses are the sole living cephalopods whose bony body structure is externalized as a shell. The animal can withdraw completely into its shell and close the opening with a leathery hood formed from two specially folded tentacles.
CHAMBERED NAUTILUS SHELL<br /> Cross section<br /> A prime example of the Golden Mean logarithmic spiral found in nature, and based on the Fibonacci Series of numbers, the progression in which 2 initial terms are added to form the third.