. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. HEART OF REPTILES. 511 not only by the ordinary valve on its left side, which is attached to the base of the auricular septum, but by a similar though smaller fold on the opposite or right side: this fold becomes the fleshy auriculo-ventricular valve in birds. To the junction of the two valves at their lower angle a fleshy column is attached. The ventricular cavity, ib. E, which receives the venous blood, propels it to the left aorta. A, and to the pulmonary artery, P: tlie origin of each is guarded by a pair of semiluna
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. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. HEART OF REPTILES. 511 not only by the ordinary valve on its left side, which is attached to the base of the auricular septum, but by a similar though smaller fold on the opposite or right side: this fold becomes the fleshy auriculo-ventricular valve in birds. To the junction of the two valves at their lower angle a fleshy column is attached. The ventricular cavity, ib. E, which receives the venous blood, propels it to the left aorta. A, and to the pulmonary artery, P: tlie origin of each is guarded by a pair of semilunar valves. Immediately above the larger of those of the left aorta is an orifice leading into the right aorta: in fig. 339, a bristle is passed from the left aorta throuo;h this orifice into the right axil- lary branch, a, of the right or brachio-cephalic aorta. In the figure, the valve is drawn down to show the orifice ; in its natural state, it conceals and woidd cover the orifice as the blood flowed from the ventricle into the left aorta. Some openings lead from the pul- monic cavity of the ventri- cle into a spongy structure, which has been defined as a particular cavity (^spatium iiiterventriculare) of the ventricle; but it is essenti- ally a part of the pulmonic chamber: bristles are passed through the orifices or in- tercolumnar spaces, leading from E to this structure, in fig. 339. The left auricle, fig. 340, M, when distended, is smaller than the right, and of a more transverse form: its muscular part is produced into an appendao-e, which almost meets that of the right auricle in front of the ' conns arteriosus, ' embracing the ' sulcus coronalis ' of the heart. There is a small pulmonary sinus receiving the short trunks of the pulmonary veins, fig. 340, I, I. The left auriculo-ventricidar aperture is defended by a broad membranous fold continued into the ventricle from the middle of the base of the interauricular sejjtum: to its margin are attached a few chords teudinea