Cassis Cornuta Shell for Sale, Horned Helmet Shell, Cassis Cornuta Seashell, also called a Yellow Helmet Shell.  The "Cassis cornuta," also called horned helmet shell, is a large heavy peach colored shell, faintly marked with whites and browns. This pretty yellow helmet shell measures approximately 8-1/2 inches tall and 7-3/4 inches wide (Few tiny holes in the back of the shell).  Carefully review all photos. This is the one you are buying. It was hand selected out of our large inventory.  Would make a nice addition to a shell collection.  These large seashells live mostly in warm waters around the world.   This is a beautiful real cassis cornuta shell - not a replica.  It will have some imperfections from living in the oceans and aging.