504 



INDEX. 



Yelk, i. 135 



arteries, i. 395 



cavity, i. 138 



duct, i. 338; ii. 168 



formative, i. 216 



membrane, i. 138 



nutritive, i. 216 



sao, i. 837 



Yelk veins, i. 395 

 vessels, i. 395 



Z 



Zona pellucida, i. 135 

 Zonaplacentalia, ii. 162, 187 

 Zoophyta, i. 246 ; ii. 73 



(1) 



THE END. 



