Emerita is a genus of clawless oval-shaped crustaceans found on the Atlantic and Pacific coasts of North and South America. Emerita are popularly known as mole crabs, sand fleas, sand crabs, beach hoppers, or even more colloquially as lookie cookies. Although like true crabs they belong to the order Decapoda, they are classified in a different infraorder, Anomura (the true crabs are in the infraorder Brachyura).

A term applied to the Vice-Chancellor, Professors, Readers, and holders of certain other senior positions, who have retired after the age of sixty. In Cambridge the term is not conferred as an individual mark of distinction (although there is provision for appointment of Honorary Professors).