Queen Helmet Large Shell, Cassis madagascariensis. This species occurs in the tropical Western Atlantic. The specific name "madagascarensis" literally means "of Madagascar", but this was a misunderstanding of the type locality by the original author. Live specimens of this helmet species can occasionally be found about 30 feet out in the ocean. Because they live so far offshore, the best time to find these shells is at low tide after a storm.
The storm pictures below were taken during a North Atlantic storm February, 13, 1987 on an eastbound passage from Tampa, Florida to Ghent, Belgium with a load of phosphates. The pictures were taken by Capt. George Ianiev, who was the ship's Second Mate at the time. The big blue wave was the largest wave the ship encountered during the storm; seeing it hit the ship made the vessel's master question whether they would survive the storm.