X 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 



BIBLIOGRAPHY 357 



INDEX 363 



