To overburden my work with the names of genera or the lists of species would not, it seemed to me, either clear the issues or interest the general reader. These may be found in the ‘Challenger’ monographs, and other books dealing with the subject.

Those who wish to pursue the subject further will find in the ‘Voyages of the “Blake,”’ by Alexander Agassiz, an excellent and elaborate discussion of deep-sea problems, and numerous illustrations of some of the most interesting forms of abysmal life.

In Volume XXIII. of the ‘Bulletin of Comparative Zoology’ the same author gives a most interesting account of the deep-sea work that has recently been done by the ‘Albatross’ expedition.

Filhol’s ‘La Vie au Fond des Mers’ is also a book that contains a great deal of new and interesting matter, together with some excellent coloured plates of deep-sea animals.

Sydney J. Hickson.

Downing College, Cambridge:

September, 1893.

CONTENTS

CHAPTER PAGE
I.A Short History of the Investigations[1]
II.The Physical Conditions of 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[59]
V.The Protozoa, Cœlentera, and Echinoderma Of the Deep Sea[86]
VI.The Vermes and Mollusca of the Deep Sea[109]
VII.The Arthropoda of the Deep Sea[123]
VIII.The Fish of the Deep Sea[148]
Index[167]

LIST OF ILLUSTRATIONS