“ The animal has a broad head, with two tentacles, with the base of which the stalks bearing the eyes are united; the proboscis is large, and the tongue armed with teeth, which are used for the purpose of rasping substances used for food—almost any animal substance being welcome for this use—or for perforating the shells of other mollusks in order to prey upon them. There are numerous species, chiefly found on the coasts of the colder parts of the world. The coasts of the North Atlantic produce several species, of which the most abundant is the ‘common whelk’ (Buccinum undatum) . ”