CONTENTS 



Introduction pase 327 



Material and methods 327 



Acknowledgements 328 



External Characters 328 



Reproductive System 329 



Previous work 329 



Male reproductive system 330 



Development of the copulatory organs 336 



Female reproductive system 2^2 



Fertilization -145 



Summary ,^8 



Bibliography . 34^ 



Plates I-V following page 350 



