x CONTENTS. 
CHAPTER V. 
Tur CoMPARATIVE MoRPHOLOGY OF THE CRAYFISH. THE STRUOC- 
TURE AND THE DEVELOPMENT OF THE CRAYFISH COMPARED 
PAGE 
WITH THOSE OF OTHER LIVING BEINGS . ° . . . 227 
CHAPTER VI. 
Tux DISTRIBUTION AND THE JETIOLOGY OF THE CRAYFISHES. . 288 
NOTES. . , . a ee - 4 o  « « 347 
BIBLIOGRAPHY . . . e. 38 * 8 6 « « 857 
INDEX . e - e « m ‘ e ; e e 363 
2 
