Examples: Cephalopoda
Spirula (helmet shape, [2, p. 249])
[alpha=76, beta=90, phi=1, mu=1, Omega=1, A=2.1, a=0.5, b=0.5, L=0]
(Click with the mouse over the picture to rotate it)
Like nautiloids and ammonites,
the small, translucent, milky white shell of the spirula coils in a flat spiral and has
many chambers (that help controlling the buoyancy).
In life, the shell is contained within the body of a squidlike animal.
Habitat: free swimming, occur worldwide in warm seas.
[2] S. Peter Dance, Shells, Dorling Kindersley, 2002.
