CONTENTS 



Introduction 



PAGE 



I 



Apparatus and Methods . . i 



Nets I 



Localities 2 



Depth of Tow 2 



Time of Tow 2 



\'olume of Tow ( Pacilic Stations Only) 2 



Qualifying Conditions 2 



Nets 2 



Depth of Tow 4 



Supplementary Data 4 



Oceanic Currents 4 



Comparisons of Plankton 



Comparison of the Two Oceans 



Comparison of Different Regions of the Pacific 



Diversity of Distribution 8 



Daytime Stratification 8 



Causes of Daytime Stratihcation 9 



Temperature . 9 



Salinity (Map 3) and Density 11 



Hydrogen-Ion Concentration 11 



Phototropism 11 



Lists of Species by Stations 15 



Discussion of Species (Alphabetically Arranged) 169 



Literature Cited 211 



List of Species Discussed 215 



Figures 1-136 218 



Index 235 



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