ONTOGENY AND PHYLOGENY OF THE STERNUM 



FRANK BLAIR HANSON 



PLATE 5 



1 1 



*' PrQmS t 



PtOmSt 



CI 



ECr 



ECr 



12 



ECr 



ECr 



/ECr 



16 



OSt 



:•*— -ECr 



ECr 



18 



-St 



101 



EC r 



• 19 



—St 



