Maybe Tegula funebralis. I saw them at Granville Island Live Lobster place and they had the name on it. I forgot if that was the same name or not.
http://www.lanecc.edu/science/zonation/turban.htm
http://people.wwc.edu/staff/cowlda/K...unebralis.html
Lots of websites say that they can live over 80-100 years.
http://oceanlink.island.net/oinfo/in.../mollusca.html
http://www.johnharveyphoto.com/Botan...ckTurbans.html
http://www.reefkeeping.com/issues/2004-05/rs/index.php
"Among their many interesting attributes, many marine snails have impressively long life spans. I have counted over 120 annual growth rings on some specimens of Tegula funebralis, a temperate water species. This species is one of the three or four species of Trochoideans collected from cool water areas of Baja California and unethically sold to gullible, or informed, aquarists as a reef aquarium animal under the delightfully ambiguous name of "margarite or margarita snail. Tegula funebralis has a high thermal tolerance for an animal that lives in cold water areas (it ranges northward from Baja and is common in the British Columbian and Alaskan intertidal zones). They normally live a small fraction of one percent of their normal life span, or only a few months, in reef aquaria. Putting these animals in a reef aquarium is both unethical and immoral."