Yellow Helmet Sea Shell - 11 inch + Cassis Cornuta

Yellow Helmet Sea Shell - 11 inch + Cassis Cornuta from the Pacific Ocean. Seashell Canada. Cassis cornuta, common name the horned helmet, is a species of extremely large sea snail, a marine gastropod mollusc in the family Cassidae, the helmet shells and their allies. The length of the shell varies between 50 mm and 410 mm. It is the largest of all helmet shells. It has a very solid, heavy, rotund shell with large, horn-like knobs and a wide, flat base. The shell has a dorsally pale orange color, its base vivid orange, faintly marked with white and brown.