. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MARSUPIALIA. 307 separated from that of the anterior cava by a simple crescentic ridge (e, figs. 131 and 132), which forms a salient angle of the parietes of the auricle between these apertures. The an- terior cava (b) returns the blood from the right side of the head and the right anterior extre- mity; the corresponding vein on the left side (c) passes down in all the Marsupials, as in Birds and Reptiles, behind the left auricle, below the two pulmonary veins, and, after receiving the coronary vein, joins the inferior c
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MARSUPIALIA. 307 separated from that of the anterior cava by a simple crescentic ridge (e, figs. 131 and 132), which forms a salient angle of the parietes of the auricle between these apertures. The an- terior cava (b) returns the blood from the right side of the head and the right anterior extre- mity; the corresponding vein on the left side (c) passes down in all the Marsupials, as in Birds and Reptiles, behind the left auricle, below the two pulmonary veins, and, after receiving the coronary vein, joins the inferior cava (d) immediately before its expansion into the auricle. F'IK. Heart of the Wombat, Where the posterior extremities are less or not larger than the anterior ones, as in the Ursine Dasyure and Wombat, the posterior cava is somewhat less than the left vena innominata (Jigs. 131 and 132), and they appear to terminate by separate apertures in the auricle; but in the Kangaroo (Jig. 131) the proportions of the two veins are reversed, and the posterior cava more obviously receives the left vena innominata before it terminates: these two veins meet at a very acute angle, and are separated by a crescentic ridge similar to, but thinner than, that which divides their common orifice from the orifice of the anterior cava. The right auriculo-ventricular valve is mem- branous, as in the placental Mammalia, and its free margin is attached by fine chorda; ten- dinese to three columns carnese ; these in the Kangaroo (fig. 131) all arise from the septum of the ventricles, but in the Wombat (fig. 132) the base of two of the columnse is situated at the angle between the septum and 'the thin outer wall of the ventricle. The right ventricle extends nearly to the apex of the heart in the Wombat, but falls short of that part in the Kangaroo. The ven- tricle is continued in the form of a pyramidal process, somewhat resembling a bulbtis arte- riosits, to the origin of the pulmonary artery (/•&
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