CONTENTS 



Page 



Introduction 1 



Hydrography of Regions Investigated 1 



Currents 1 



Temperature 2 



Salinity 2 



Phosphate 3 



Horizontal Distribution of Ceratlum . 3 



Ceratium Life Zones in the Areas Traversed by 



the Carnegie 3 



Richness of Species in Different Areas 6 



Factors Affecting the Horizontal Distribution of 



Ceratium 7 



Salinity 7 



Nutrient Salts 7 



Temperature 7 



Currents 8 



Other Factors 10 



Page 



Comparison of the Atlantic and Pacific Waters on 



the Basis of Their Ceratium Floras 10 



The Vertical Distribution of Ceratium 12 



The Ceratium Species of the Carnegie Collection . 14 



Subgenus Poroceratium 14 



Subgenus Blceratium 16 



Subgenus Amphiceratium 22 



Subgenus Euceratium 25 



Literature Cited 46 



Appendix Tables 1-54 47 



Figures 1-27 163 



Charts 1-54 187 



Index 209 



/v 



IVl; 



vii 



