A naturalist's guide surveying coastal and freshwater crustaceans—crabs, shrimps, prawns, lobsters, and crayfish—describing their anatomy, life cycles (including larval zoea), habitats from rock pools to reefs and rivers, behaviors, defensive armour and molting, and ecological interactions. The text provides species descriptions and identification, local varieties, and practical methods and equipment for catching, keeping, and rearing them, with advice on pots, nets, traps, baiting, and hatching. It also touches on culinary uses and human employment of crustaceans, pairing scientific observation with field anecdotes and illustrated instructions intended for fishermen, collectors, and amateur naturalists.