TIIK DKVEI.OPMKNT OF THE HEART IN SHAD. 

 H. D. SIOVKIU. 



— 4E 



Lateral plate 



Somltal -* 



mesoderm 



Notochord ^ q Entodermal pharynx, 

 dorsal wall 



Mandibular pouch 



Hyo-branchial anlage 



Lateral pla 

 Entodermal pharynx 

 ventral wall 



Fig. 4.— Diagram of the veiitral surface of a reconstruction of the peri- 

 cardial region of sliad. sta.iie of is somites X 100 diams. See exitlanatioii of 

 figures, footnote on opijosite ]»age. 



The Amekican .Tournal of Axato.mv. — Vol. IX, No. 2 



