What is the largest sea shell in the world?

The origin of the brand name Shell is linked to the origins of The "Shell" Transport and Trading Company. In 1833, the founder's father, also Marcus Samuel, founded an import business to sell seashells to London collectors. When collecting seashell specimens in the Caspian Sea area in 1892, the younger Samuel realised there was potential in exporting lamp oil from the region and commissioned the world's first purpose built oil tanker, the Murex, to enter this market. By 1907 the company had a fleet of oil tankers.