640 INDEX 



Zingiber {see also Ginger), 90, 91 



Zon, R., 243, 253, 281 



Zonation of shore-vegetation, 319, 492, 



493. 526-7, 529, 530, 532, 536-8 

 — , soil, 297, 299 

 Zone, aphotic, 473, 518, 538-40 

 — , austral, 186 

 — , boreal, 186 

 — , climatic, 10, 20 

 — , dysphotic, 473, 488, 495-6, 518 

 — , eulittoral, 492-4, 512, 513, 527, 530, 



534 

 — , euphotic, 473, 511, 518, 539 

 — , infralittoral, 493, 495-6, 511, 513, 



527 

 — , littoral, 492, 493, 513, 526, 527 

 — , lower sublittoral, 527, 533, 536 

 — , montane, 377, 467, 468, 470 



Zone, sublittoral, 492, 493, 495, 513, 



529-38 

 — , supralittoral, 513, 526, 527, 530, 



532, 535 

 — , twilight, 488, 495-6, 511 

 Zoned subclimaxes, 370, 393, 402-3, 



404. 405 



Zones, temperature, 10 



Zoochlorello, 495 



Zoogeographical realms, 18, 19, 212, 213 



Zooplankton, 479, 480, 519 



Zoospore, 37, 45 



Zostera (Eel-grass), 43, 524, 528, 530, 



531. 532, 535 

 • — , mud and, 528, 530 

 — , ' wasting disease ' of, 43, 524 

 Zostera marina (Eel-grass), 535 

 Zygote, 42 



