122 CHECK LIST OF THE FISH OF ONTARIO. 



w. 



Web. The vane of a feather, on either side of the rhacis, or "stem"; 

 also the membrane connecting the toes. 



Xiphisternum. Tip of the sternum. 



Z. 



Zygapophyses. Points of bone affording to the vertebrae more or less 



definite articulation with each other. 

 Zygodactyle. Yoke-toed; having the toes in pairs, two in front, two 



behind. 

 Zygoma. The malar or cheek bone. 



