504 



YELK, i. 135 



arteries, i. 395 



cavity, i. 138 



duct, i. 338 ; ii. 168 



formative, i. 216 



membrane, i. 138 



nutritive, i. 216 



sac, i. 337 



INDEX. 



I Yelk veins, i. 395 



vessels, 



Zona pellucida, j. 135 

 Zonaplacentalia, ii. 162, 187 

 Zoophyta, i. 246 ; ii. 73 



THE END. 



PRINTED BY WILLIAM CLOWES AND SONS, LIMITED, LONDON AND BECCLES. 



