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. 



X. 



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. 



