Shalom Andrew Grebneff,
Your posting on ammonoids and nautiloids was very interesting and enlightening, as I was under the impression, as are many others, that the camerae were used for buoyancy.
If indeed they are constantly full of gas, and are not occasionally filled with liquid, what is the efficacy of the siphuncle running through all the septal necks of the camerae, and not just through those which are to be emptied?
Is it to prevent the liquid from refilling the empty ones?  Could this not be achieved by sealing the small canals with callus?
Sincerely, Moshe Erlendur Okon
One of the last geese in Reykjavík, Ísland