CONTENTS 



Introduction page 437 



Feeding Mechanism 438 



Skeleton and Body Wall 441 



Endoskeleton and Sclerites '441 



Endosternite 445 



Dorsal Body Wall 446 



Blood System 448 



Heart and Pericardium 448 



Blood Vessels 453 



Circulatory Process 456 



Gut 462 



Nervous System 465 



External Anatomy 465 



Basal Ganglion System 468 



Sympathetic System 471 



Internal Structure 472 



Giant Fibre System 474 



Segmental Excretory Organs 476 



Summary 479 



Literature cited 480 



Plates VI and VII following page 482 



