The Morphology of Cosmobia 



389 



ventricle of component A. This is the proper pulmonary arch of this 

 component, but the pulmonary arteries are distributed to the two lungs 

 of the perfect side and thus the right ventricle of A supplies its own right 

 lung and B's left one. 



B'. 



Ven.dex. B. 



Vena cava post, of B. 



Aorta of A 



LVena cava post, of A, 



Atr. sin, 8. 



Subcl. sin. B. 



-Subcl. dex. B. 

 Ven. sin. B, 

 Ven. dex. A. 



B 



-Aorta of B. 



Fig. 18. Diagram of the main organs of circulation in tlic Baldwix Synote, 

 as shown by dissection. The right auricles and the systemic A-eins are shaded, 

 the other parts are outlined. The view is taken a little obliquely, and with 

 the hearts at slightly different levels, in order to show the parts better. This 

 brings the vessels of the common neck, which are in reality closely associated, 

 at an unnatural distance from one another. It also produces an abnormal 

 lengthening of the aortic arch which extends from the lesser heart to the 

 aorta of B. Otherwise the proportions are not far from the natural ones. 



In the lesser heart the pulmonary arteries proceed from a trunk com- 

 mon to both arches, but may be considered as coming from that part 

 that belongs to the right ventricle, which belongs to component B. This 

 would make them normal in origin. They are distributed in a manner 



