Description of Plate 9. 



Vascular System of Necturus maculatus. . a 



The arterial system of Necturus maculatus; diagram some- 

 what less than the natural size of the animal. The dissection 

 was made from the ventral side. The ventral aorta and its 

 branches are represented by shaded vessels ; the systemic ar- 

 teries as solid vessels. The left arm and leg have been omitted 

 from the diagram, also a few of the smaller vessels described in 

 the text, for the sake of clearness. 



