PREFACE 



Crustaceans were collected by several members of the 

 Harriman Expedition, particularly by Professor Trevor 

 Kincaid, Professor W. B. Ritter, and Dr. Wesley R. Coe. 

 After the return of the Expedition these specimens were 

 arranged by groups and sent to specialists for study. 

 The Decapods have been elaborated by Miss Mary J. 

 Rathbun, who has included in her investigation the exten- 

 sive collections from the Pacific coast already in the 

 United States National Museum, so that her paper may 

 be regarded as a comprehensive revision of the group 

 for the west coast of North America from California to 

 Arctic Alaska. The Isopods have been treated by Miss 

 Harriet Richardson, the Amphipods by Dr. S. J. Holmes, 

 the Pycnogonids by Dr. Leon J. Cole. The chapter 

 headings are from the facile pens of Mrs. Louise M. 

 Keeler and Mr. F. A. Walpole the Amphipods by Mr. 

 Walpole, the others by Mrs. Keeler. 



C. HART MERRIAM, 



Editor. 



WASHINGTON, D. C., 

 May I, 1903 



