This large snail has an 815 cm tall, conical shell strongly reminiscent of an ice cream cone. The largest of Horn snails, the heavy conical shell is actually beautifully marked but the patterns are usually hidden by mud and other encrusting animals. The outer lip is thin and not flared. Operculum small and circular. The animal is velvety black with a highly extendible proboscis. There is a third eye on its mantle margin, in addition to a pair of eyes at the tentacles. It can stay out of water for long periods of time.