74 



AMPIIIOXUS. 



During the larval stages the young Amphioxus leads a 

 pelagic life, and is found most abundantly, not at the surface. 



but at depths of from fifteen to twenty fathoms. At the close 

 of the period, it usually abandons its pelagic life, and adopts the 



The actual time, however, at 



burrowing habits of the adult. 



