

INDEX 



597 



Wyville-Thomson Ridge, 171 

 Wyville-Thomson Ridge, a temperature 

 barrier, 158, 159 



Xeric animals. 48, 378, 379 

 Xeric areas, 451 

 XerobdeUa lecomtei, 37S 

 Xerocoles, 48 

 Xerophila, 378 

 X< rus, 447 



Yoldia, 264 



Zacharias, 358 71 , 376 37 

 Zacher, 71 43 , 96 7 

 Zapus, 450 



Zarudny, 420 1 - 7 

 Zeusfaber, 190 



Zimmer, 28G 15 



Zittell, 55 40 . 120" 



Z octrees, 2Uti 



Zobell, 1G2- 1 



Zonal endemism, 496 



Zonation, 494 



Zoogeography, compared with phytoge- 



ography, 1 

 Zoogeography, defined, 1 

 Zooxanthellae, 209 

 Zospeum, 92 

 Zostera, 161, 180 

 Zschokke, 71 17 - --• » 357 20 - -'• 23 - ", 376» 



504 49 

 Zuelzer, 55 4 

 Zugmayer, 5O4 40 - : ' 2 



Zuntz, Loewy, Muller and Caspari, 5u:i J 

 Zygaena seriziata, 125 



