CONTENTS. 



CHAPTER V. 



PAGE 

 TUE CoJirAKATIVE MORPHOLOGY OF THE CRAYFISH. ThE STRUC- 

 TURE AND THE DEVELOPMENT OF THE CRAYFISH COMPARED 

 WITH THOSE OF OTHER LIVING BEINGS 227 



^ CHAPTER VI. 



The Distribution and the jEtiology of the Crayfishes . . 288 



NOTES 347 



BIBLIOGRAPHY 357 



INDEX . 363 



