THK DKVKLOP.MKNT OK THK HEART IN SHAD. 

 H D. si;vi(nt 



Pericardial coclom 



Ventral aortic ceils ' ~ ' Pericardial coclom 



Ventral aortic cells ■ — -Aortic 



ID 



Fig. 7. — Diagram of tlie ventral surface of a reconstruction of the peri- 

 cardial region of shad, stage of 32 somites X 100 dianis. See explanation of 

 figures, footnote on page 220. 



The Aajerican .Tournal of Anatomy. — Vol. IX, No. 2. 



