CONTENTS 



SWIMBLADDER STRUCTURE OF DEEP-SEA FISHES IN RELATION TO THEIR 

 SYSTEMATICS AND BIOLOGY (published 7th November i960) 



By N. B. Marshall 



Introduction P a S e 3 



Material and Methods 5 



Survey of Structure 6 



Structure and Systematics 5° 



The Swimbladder as a Hydrostatic Organ 68 



Bathypelagic Fishes without a Swimbladder 81 



Vertical Distribution and the Swimbladder 82 



The Physics and Biology of Vertical Migrations 85 



Pelagic and Benthic Fishes, the Swimbladder, and Aspects of the Economy of Deep-Sea 



Life 95 



Summary IJ 3 



References IJ 6 



Plates I-III following page 122 



THE BENGUELA CURRENT (published 30th November i960) 

 By T. John Hart and Ronald I. Currie 



Introduction P a g e I2 7 



Previous Work I 3° 



Methods used in the 'William Scoresby' 135 



Itineraries H 1 



Coastal Geography and Bottom Topography 144 



Meteorology H7 



Surface-Currents J 53 



Observed Distribution of Temperature and Salinity 156 



The Water Masses J 75 



Upwelling J ^4 



Non-Conservative Properties l 9 2 



Bottom Deposits ; 20 4 



Microplankton 20 ° 



zooplankton 2 °8 



Economic Resources of the Benguela Current 274 



Review of the Main Features of the Benguela Current 277 



Comparison of the Benguela Current with other upwelling regions .... 280 



Organic Production in the Benguela Current 284 



Summary 2 °° 



References 2 °9 



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