. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. Md. VaA-. Fic. Fic. 256. Fig. 255.—Heakt of a YonNG Crocodilun nilotkus. From the dorsal side. (After Rose). , common carotid ; , , subclavian arteries ; and , left and right aortic arches ; , mesenteric artery ; L. , H. , left and right atria ; , coronary vein. Other letters as in Fig. 244. Fig. 256.—Heart of C'rorodilns nihtirus. From the right side. (After Rose). Part of the wall of the right atrium is removed. , atrio-ventricular aperture ; and , the two si
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. Md. VaA-. Fic. Fic. 256. Fig. 255.—Heakt of a YonNG Crocodilun nilotkus. From the dorsal side. (After Rose). , common carotid ; , , subclavian arteries ; and , left and right aortic arches ; , mesenteric artery ; L. , H. , left and right atria ; , coronary vein. Other letters as in Fig. 244. Fig. 256.—Heart of C'rorodilns nihtirus. From the right side. (After Rose). Part of the wall of the right atrium is removed. , atrio-ventricular aperture ; and , the two sinu-auricular valves, the white line between which is the margin of the sinu-atrial septum. Other letters as in Figs. 244 and 245. this septum, may appear to enter the right atrium independently {, Snakes,) The pulmonary veins unite into a single trunk before entering the left atrium. Birds and Mammals.—In these Classes, the atrial and ventri- cular septa are always complete, and there is no longer any mixture. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wiedersheim, Robert, 1848-1923; Parker, William Newton, 1857-1923. London, Macmillan
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