xm 



PHYLUM CHORDATA 



499 



bone, taking a share at its dorsal end in the bounding of the glenoid 

 cavity, and at its ventral end articulating with the sternum, is 



tn " 



is 



'ft'S 



a 



Is 



sj 



0) 



5 S 



5ll 



W*5 ^ 



S&| 

 s- 



SS 



II 



g^-3 



5 - 



i .& 



<D O 



gas 



-li 



O 



M 



f=l 



never present, in the adult, as a distinct bone. In the young of 

 many Mammals it appears to be represented by a small ossification 



