CONTENTS. 



CHAPTER V. 



MM 



THE COMPARATIVE MORPHOLOGY OF THE CRAYFISH. THE STRUC- 

 TURE AND THE DEVELOPMENT OF THE CRAYFISH COMPARED 



THOSE OF OTHER LIVING BEINGS . , 227 



CHAPTER VI. 



THE DISTRIBUTION AND THE ^ETIOLOGY OF THE CRAYFISHES . , 288 



NOTES 34? 



BIBLIOGRAPHY . . . 857 



INDEX . *8 



