CONTENTS. 



CHAPTER V. 



PAGE 



The Comparative 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 Etiology of the Crayfishes . . 288 



NOTES 347 



BIBLIOGRAPHr 357 



INDEX. 363 



