Tiger striped helmet conch seashell, Cassis tuberosa, 6 inches = 15 cm; Here is a lovely vintage display specimen of a genuine Queen Helmet conch shell (Cassis tuberosa). As would be expected, it shows some wear/age on the topside that is consistent with natural weathering & aging. Cassis tuberosa, the king helmet, is a species of very large sea snail with a solid, heavy shell, a marine gastropod mollusk in the family Cassidae, the helmet shells and their allies.[1] This species occurs in the Western Atlantic Ocean in: North Carolina, Florida, Mexico, Honduras, Colombia, Costa Rica, Panama, Venezuela, Bermuda, Bahamas, Turks & Caicos, Cuba, Hispaniola, Puerto Rico, Virgin Islands, Leeward Islands, Windward Islands, Brazil, and in the Eastern Atlantic Ocean at the Cape Verde Islands. [3] Base: 5” x 5.5 inches; Length: 6 inches = 15 cm; Weight: 517 g = 1 lb. 2.3 oz.