o8G Harris Hawthorne Wilder 



from the right ventricle of the heart on the perfect side (A's) crosses 

 over to the aorta of B and does not turn the other way and join the 

 dorsal aorta that belongs to A's vertebral column. The fact that the 

 arch from the right ventricle of the synotic heart comes over to B's aorta 

 is the usual thing in such Cosmobia, since this heart moiety belongs 

 originally to the B component. An innominate trunk arises from the 

 arch that comes from the left ventricle and branches to form the carotids 

 for the perfect aspect. Thus both a B half and an A half are supplied 

 from an aortic arch that belongs to B. 



There are separate pulmonary arteries for the two lungs, and they 

 both arise from the pulmonary arch that comes from the right ventricle, 

 i. e., A's. The artery to the right lung (A's) is large and easily seen, 



n 



Left Lung of B. 



Fig. 13. Baldwin Synote, Teras III. Lungs of perfect side, the right of A. 

 and the left of B ; outer aspect, with heart removed. The arrows denote the 

 points of entrance of the arteries and of exit of the veins. The numbers 

 designate the lobes ; those of the left lung are not well separated. Compare 



with Figs. 10 and 11. 



but that to the left (B's) enters the lung at a point where this latter 

 organ is adherent to the side of the arch. This is indicated in Fig. 

 10 by a dotted ring; and the point where it enters the lung is shown 

 in Fig. 13. The pulmonary veins likewise, owing to the close adhe- 

 sion of the lungs to the heart, can be seen only by cutting the two organs 

 apart, when they appear as openings [Fig. 13]. There seems to be but 

 one such vessel for each lung, and they enter the left atrium on the ana- 

 tomical dorsal aspect. The two veuie cavfe are normally related to the 

 right atrium. 



The heart and lungs of the smaller chamber, that of the synotic side, 

 are more reduced than are those of the perfect side, and are crowded into 

 a considerably smaller space, lying rather more in the territory belong- 

 ing to the A component. [Figs. 14-17.] Tlie lungs are quite closely 



