1895.] 



OS THE HEART OF THE ALIjIGATOB. 



349 



the two aorta?, and nearly an inch and a half anterior to it, there is 

 a deep pit in the right aorta, shown in the drawing (iig, 1, B). This 

 is separated by a transparent window from the space behind the 

 lowest of the three principal rudimentary valve-like structures 

 in the left aorta ; however, there is no actual communication. 



Fig. 4. 



Heart of Alligator, opened to show the left lentriclc and origirCj)f the 



right aorta. 

 a. Aperture of eoronai^ artery, b. Foramen Panizzi. c. Eight aortic arch. 

 d. Outer or left flap of left aiu-iculo-ventricular valve cut through to 

 show, underlying it, the septal flap of the same valve, which is larger in 

 size, and the membranous margin of which is indicated by the dotted 

 jirea in the drawing. 



