1906.] 



RESPIRATORY SYSTEMS IN THE OPHIDIA. 



Text-fisr. 86. 



501 



A portion of body-wall of Uri/fJirolamprus cesciilapii, to show arrangement 

 of intercostal arteries. 



a. An intercostal bifurcating to supply both sides of mid-dorsal line; 



b. An intercostal supplying only left side; 



c. An intercostal supplying only right side. 



