338 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



ACKNOWLEDGMENTS 



For material used in the preparation of this paper and for assistance 

 in the study and interpretation of it, expression of gratitude is due to 

 many. 



For the opportunity of accompanying the Expedition of the Velero 

 III special thanks is due Captain Allan Hancock for his generosity. 



For the facilities of his laboratory, collections, and slides, as well as 

 for financial assistance throughout the work, I am deeply indebted to 

 Professor William A. Setchell. 



Grateful acknowledgement is due, for collections of specimens, to 

 Dr. Francis Drouet, Mr. E. F. Ricketts, Mr. Victor Johnson, and Mr. 

 John Poindexter; for help in the study and interpretation of specimens 

 and data, to Dr. W. A. Setchell, Dr. G. J. Hollenberg, Dr. G. M. 

 Smith, Dr. W. R. Taylor, and Dr. A. R. Davis; for reading and criti- 

 cizing the manuscript, to Dr. Lee Bonar, Dr. W. A. Setchell, Dr. Ralph 

 Emerson, Dr. A. R. Davis, and Dr. G. M. Smith; for assistance in the 

 preparation of the manuscripts, to Miss Maxine Christianson and Mr. 

 N. Christianson ; for the loan of type specimens, to Miss Alice Eastwood 

 of the California Academy of Sciences and Dr. F. J. Seaver of the New 

 York Botanical Gardens. 



Acknowledgement is due Dr. H. V. Sverdrup of the Scripps Institu- 

 tion of Oceanography of the University of California for the use of 

 oceanographical data from the Gulf of California, a part of which is 

 here reproduced. 



Finally, I am especially indebted for the facilities afforded me in my 

 work by the Department of Botany of the University of California. 



