308 



MR. F. E. BEDDARD OX THE 



[Nov. 3, 



the point, it will be seen that in any case the conditions obtaining 

 in the example dissected by those anatomists differ from those 

 which characterise the example dissected by myself. Moreover, 

 Hyrtl shows the pulmonary ai'tery as arising fiom the third 

 aortic arch. 



Text-fig. 31. 



Transverse section through right branch of Synangium of Megalohatrachns. 

 P, pulmonarj' ; C, carotid. Between them the two aortic trunks. 



Coronary Artery. — Before leaving this region of the heart it is 

 necessary to call attention to the coronary artery, which has not 

 been studied by Osawa. The artery in question lies upon the 

 dorsal surface of the conus arteriosus, to which region it is 

 limited so far as a naked-eye inspection enables me to judge. It 

 is much contorted in its course, a state of affairs which, of course, 

 allows of the expansion of the conus without unduly distending 

 the artery. The coronary artery is exactly median in position, 

 corresponding to the internal septum which divides the synangium 

 into two halves. At its origin, however, which is from the 

 externally undivided region of the synangium, it is deflected to 

 the right, and is seen to communicate with one (the second) of 

 the two aortic arches ; its orifice is guarded by a strong valvular 

 flap. I could not ti-ace the coronary artery with cei'tainty farther 



