862 



Subject Indt 



Wombat, 734, 735 

 Woodchuck, 740 



Woodpeckers, 530, 551, 553 



Wrens, 553 



Wrist (carpus), 131 



Yolk-mass, 249, 256, 257 

 Yolk-sac, 241, 242, 289, 293-295 



cavity of, 292 

 Yolk-stalk, 6, 290 



Xenarthra, 742-745, 



Yolk, 233-235, 236, 237, 240-243, 

 248, 249, 251, 254, 256, 257 

 266, 288, 290 

 plug, 254, 255 



Yolk-cells, 253, 255, 256 



245, 

 263, 



Zaglossus, 733 



Zebra, 752 



Zinn, zonule of, 203, 683 



Zona fasciculata, 219 



pellucida, 236, 237 

 Zonary placenta, 294 

 Zonula ciliaris (zonule of Zin 

 Zygapophysis, 108 

 Zygomatic arch, 128, 601 



muscles, 98 



I, 683 



