INDEX 



373 



N A CELL A pellucida, 61 

 Naples Laboratory, 14, Plate 5 

 Nassa, 40 

 Naturalist's dredge, 261, Text 



fig. 54, 

 Nautilus, 22 

 Navicula fusiformis var. ostrea, 



301 

 Neap tides, 237, Text fig. 50 

 Nekton, 58 



Nemertina, 19, 34, 67 

 Neoturris pileata, 204 

 Nephrops norvegicus, 67, 316, 



Plate 113 

 Nephthys, 38 

 Neptuna, 68 

 Nereilepas, 45 

 Nereis diversicolor, 34 

 Nets, 262 ; Cast, 287 ; Drift, 



278, 285 ; Japanese, 287 ; 



Mullet, 287, Plate 101 ; Seine, 



282, 285, Text fig. 58 ; Stake, 



286 ; Trawl, 273, 274, Text 



fig. 57, Plates 99, 100 ; Tuck, 



283 

 Nitrates, 219, 246 

 Noctiluca miliaris, 187, Text 



fig. 38 

 North Atlantic Drift, 230 

 North Equatorial Drift, 229 

 North Sea, 217 

 Norway lobster, 67, 316, Plate 



113 

 Notched wrack, 30, Plate 20 

 Nullipores, 65, 159, 165, Plate 61 

 Nymphon robustum, 71, Plate 25 



OCEAN, Greatest depth of, 4 



Ocean seasons, 243 



Oceanic circulation, 229 ; cur- 

 rents, 222, 228, 257 



Oceanic fishes, 91 ; Feeding of, 

 209 ; Plate 76 



Oceanographical expeditions, 10, 

 12 



Oceanographical research, 



Methods of, 254 

 Oceanography, History of, 8 



Octopus, 23, 69, 74, 182, 192, 

 Plate 27 ; Mouth of, 206, 

 Plate 78 



Octopus vulgaris, 69 



Odontosyllis, 189 



Oikopleura, 199, 266, Text fig. ±2 



Oncaea mediterranea, 117, Plate 

 41 



Oozes, distribution of, 56, Plate 

 19 



Ophiocoma, 63, Plate 24 



Orca gladiator, 103 



Organ-pipe coral, 158, Plate 59 



Ormer, 350, Plate 121 



Oscanius, 49 



Oscillatory waves, 239, Text fig. 

 51 



Ostrea, 294, Plate 105 



Otoliths of plaice, 326, Plate 118 



Otter-trawl, 274, Plate 100 



Overfishing, Danger of, 334 



Oxygen, 220 



Oyster, 40, 198, 250, 293, Plate 

 105; Artificial rearing of, 313; 

 " Claires," 300, Plate 108 ; 

 Collectors, 297, Text fig. 60, 

 Plate 107 ; Green, 301 ; Larval 

 stage of, 296, Text fig. 59 ; Life 

 history of, 295 ; Manner of 

 feeding, 1 98, Plate 75 ; Parks, 

 298, Plates 106, 107 ; Portu- 

 guese, 294, 301, Plate 105 ; 

 Purification of, 312. 



Oyster cultivation, 294 ; in 

 Australia, 303 ; in Great 

 Britain, 302 ; in France, 295 ; 

 in Japan, Norway, United 

 States, 303 



PACIFIC OCEAN, 1, 8, 231, 239 

 Pack ice, 241, Plate 84 



2B* 



