390 Harris Hawthorne Wilder 



exactly comparable to those of the perfect side, that is, to the right lung 

 of B and the left one of A. 



3. Four imlmonary veins, iico for each heart. These communicate with 

 the left atrium of each heart and enter at points where the lungs are 

 adherent to the atrial wall. The vessels thus have no length except that 

 which is within the lungs, and appear merely as foramina in the walls of 

 the atria. Their relations are thus normal with reference to the lungs, 

 but it is to be noticed that the left lung in each case belongs to the other 

 component from that to which the atrium belongs. 



4. Two carotid trunls, one from each heart. The trunk of the perfect 

 side is given off from the arch that arises from the left ventricle, and 

 thus primarily belongs to component B; that of the synotic side arises 

 from the arch that aj^parently arises from the right ventricle, and thus 

 belongs to B also. Upon the perfect side the carotid trunk divides into 

 two laterally placed common carotids, one for the right side of A, the 

 other for the left side of B; these soon divide again into external and 

 internal carotids, as normally. Upon the synotic side there is a common 

 carotid for the left side of A, but upon B's right side the external and 

 internal carotids are separated down to the main trunk. 



5. The subclavian arteries. These proceed from the aortas posterior 

 to the separation of the carotids, and at a point where the two components 

 have become nearly distinct. A pair is given off from each aorta and 

 these supply the two arms of the component to which the aorta belongs. 



6. The anterior and posterior vence cavce. Each right atrium receives 

 an anterior and posterior vena cava, as in the case of a normal individual, 

 but while the posterior cava comes from a single body and empties into 

 the atrium belonging to it, the anterior cav^ are related to aspects instead 

 of components and the two sides from which each comes are those of 

 two components. This relationship is like that of the carotids, except 

 in the matter of final connection with the heart. 



E. Comparison of the circulation here with that of other reported cases 

 of the same general type. The best proof of the statement that an 

 abnormal Cosmobion represents a distinct physiological problem to be 

 solved anew in each case comes from the comparison of functional parts 

 in several different specimens of the same general type. Fortunately 

 for the investigator Janus monsters are not rare in the human species 

 and, although not able to survive the period of birth, they live and 

 develop up to this epoch without suffering any special deformation save, 

 perhaps, a limited growth of such parts as the lungs, which are cramped 



