504 



INDEX. 



YELK, i. 135 



arteries, i. 395 



cavity, i. 138 



duct, i. 338; ii. 1G8 



formative, i. 216 



membrane, i. 138 



nutritive, i. 216 



sac, i. 837 



Telk veins, i. 395 

 vessels, i. 305 



Zona, pellucida, i. 135 

 Zonaplacentalia, ii. 162, 187 

 Zoophyte, i. 246 ; ii. 73 



THE END. 



