James Wood of Dalhousie University in Halifax, Nova Scotia has built a comprehensive and easily-navigated page dealing with this fascinating group of marine organisms. The class Cephalopda, which contains the squids, nautilus, cuttlefish, and octopuses, contains the largest invertebrates and those with the most highly developed nervous systems. This site is an outstanding source of information on taxonomy and life-history, as well as color images of living and extinct cephalopods. It contains numerous links to related sites including In Search of Giant Squid.