TABLE OF CONTENTS 



INTRODUCTION 1 



ACKNOWLEDGEMENTS 4 



DESCRIPTION OF THE AREA 5 



CHART OF THE AREA 6-7 



CRUISES OF THE VELERO IV CONCERNED WITH 



QUANTITATIVE SURVEY 9 



LIST OF STATIONS 11 



ANALYSES OF SAMPLES BY DEPTHS 39 



ANALYSES OF BIOLOGICAL MATERIALS 41 



SUMMARY OF RESULTS 144 



APPENDICES 



A. Improved Techniques for Ocean Bottom Sampling, 



by Floyd E. Durham 152 



B. A List of the Mollusca identified from samples of the Benthos 



of San Pedro Basin, California, by Norman T. Mattox . . 154 



C. A List of Phoxocephalid Amphipoda identified from samples of 



the Benthos of San Pedro Basin, California, by J. Laurens Barnard 159 



D. A List of Brachiopoda identified from samples of the Benthos 



of San Pedro Basin, California, by Olga Hartman . . . 164 



E. A List of Enteropneusta identified from samples of the 



Benthos of San Pedro Basin, California, by Keith Woodwick . 166 



F. A List of Polychaetous Annelids identified from samples of 



the Benthos of San Pedro Basin, California, by Olga Hartman . 168 



PLATES 187 



