TABLE OF CONTENTS 



Introduction ' 



Larval Morpholog>' " 



Fixed Parts of the Head " 



Endoskcleton *2 



Movable Parts of the Head l5 



Spinneret ^" 



Prepliar>iix " 



Setae of Trunk ^' 



Larvapods ■'* 



Postembryology •'' 



Number of Molts ^' 



Postembryonic Changes *^ 



Adfronta! Sutures *° 



Epicranial Stem *' 



Determination of Burrowing Habit *^ 



Resistance to Submergence 52 



Epicranial Index and Subterranean Habit 56 



Postembr>ology of Labium and Spinneret °" 



Larvapods 



Crochets ^' 



80 

 Summary • 



Postscript °r 



Bibliography ^ 



Explanation nf Plates 



