706 



INDEX 



X 



Xenia hicksoni, 9 

 Xenopus lavis, 20 sqq. 



Y 



Yak, 49 



Yolk-sac, 378 ; nutritive 



ance of, 380 spq. 

 Yule, 621 

 Youatt, 334 

 Yung, 625 



import- 



Zacharjewsky, 497 sq., 503, 505 sq., 



510 

 Ziegler, 641 

 Zoarces, 151 

 Zoth, 309 

 Zunte, L., 68, 355 



E., 519 



Zweifel, 505 

 Zweitel and Abel, 346 



Printed by Ballantyne, Hanson &• Co. 

 EcUnburgli &^ London 



