CONTENTS 



CHAPTER PAGB 



I. A Short History of the Investigations . 1 



TI. The Physical Conditions op the Abyss . . 17 



III. The Relations of the Abysmal Zone and the 



Origin of its Fauna 45 



IV. The Characters of the Deep-sea Fauna . 50 



V. The Protozoa, Ccelentera, and Echinoderma 



of the Deep Sea 86 



VI. The Vermes and Mollusca of the Deep Sea 309 



VII. The Arthropoda of the Deep Sea . . . 123 



VIII. The Fish of the Deep Sea 148 



Index 167 



