158 



THE CIRCULATORY SYSTEM 



[CH. 



Fig. 71. Dorsal vessel of larva of Aeschna ( x4f). a.lig. anterior ligament; a.m. 

 alary muscle; d.aort. dorsal aorta; ol osteole; ost ostia; pc pericardium 

 (dotted outline) ; p.lig. posterior ligament ; Th thorax ; v valves of heart ; 

 1-10 abdominal segments; i-viii chambers of heart. After Zawarsin. 



