ACKNOWLEDGMENTS 



A biological study of the scope attempted in the Sacramento 

 River Water Pollution Survey requires the efforts of many people. Special 

 thanks are due to Marvin Peyton of the Department of Water Resources, 

 who assisted in most of the field collections upon which this report is 

 based. 



Thomas Bailey, Bnjce Butterfield, Richard Daum, and Stuart 

 Struchen all assisted in the field collections. 



Mrs. Evelyn Oathout, Librarian, provided invaluable assistance 

 in obtaining references to resolve taxonomic difficulties. 



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