Crustaceans. 53 



disturbed. Other small insects are common on the beach, 

 burrowing in wet sand or hiding under stranded seaweeds, 

 either in the perfect condition or as maggots, and usually 

 undergoing a short daily immersion. Some larvae of Diptera 

 (two-winged insects like the flies) normalh' \\\e in tlie sea, which 

 they onl)' leave as perfect insects. 



