X CONTENTS 



CHAPTER III. 



LIFE IN THE SEA. 



Zones of life — Littoral, laminarian and coralline zones — Benthos, nekton 

 and plankton — The deep-sea fauna — The migratory fauna — The plankton — 

 Constituents of the plankton. Fishes, Ascidians, Crustacea, Mollusca, Worms, 

 Echinoderms, Coelenterates, Ctenophores, Protista, Peridinians, Foraminifera, 

 Radiolaria, Diatoms, other Protista 54 



CHAPTER IV. 



LIFE IN THE SEA. 



Perman'ent and transitory plankton — Life-histories of marine animals — 

 Direct and indirect modes of development — Larvae of marine animals — The 

 struggle for existence in the sea — Destruction in the sea — Fecundity of marine 

 animals— Protection of the eggs and larvae — Seasonal variations in the plank- 

 ton — Migrations of fishes — The struggle for food in the sea ... 81 



# CHAPTER V. 



THE SEA-FISHERIES. 



Economic marine products — Exploitation of the sea — Influence of man on 

 the marine fauna — Methods of fishing — Trawlers, drifters and liners — Pelagic 

 and demersal fishes — Classes of fishermen and their economic condition — 

 The shell-fisheries 102 



PART 11. 

 QUANTITATIVE MARINE BIOLOGY. 



CHAPTER VL 



QUANTITATIVE PLANKTON INVESTIGATION. 



The Hensen nets and methods — Construction and method of use of 

 quantitative plankton nets — The catch and its preservation — The "Korbnetz" 

 — The Petersen- Hensen net — Estimation of the catch of a quantitative 

 plankton net — Volume, chemical composition, mass and enumeration of 



