OCR Text |
Show 1895.1 ON THE HEAET OF THE ALLIGATOE. 349 the two aortse, and nearly an inch and a half anterior to it, there a deep pit in the right aorta, shown in the drawing (fig. 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 ventriclejind origin[of the right aorta. a. Aperture of coronary artery, b. Foramen Panizzi. c. Right aortic arch. d. Outer or left flap of left auriculo-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 area in the drawing. |