The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etc of the Royal college of surgeons of Edinburgh, in the summer of 1872 . Fig. 136.—Bulbus arteriosus and ventricle of sturgeon,—the former (a) displaying five rowsof semilunar valves (i), the latter an auriculo-ventricular valve (c), with numerous tendinousbands running into it-—Original. Fig. 137.—Bulbou3 arteriosus and portion of ventricle of lepidosteus. Shows the greatthickness of the bulb (a), and of the valves ib), between wh
The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etc of the Royal college of surgeons of Edinburgh, in the summer of 1872 . Fig. 136.—Bulbus arteriosus and ventricle of sturgeon,—the former (a) displaying five rowsof semilunar valves (i), the latter an auriculo-ventricular valve (c), with numerous tendinousbands running into it-—Original. Fig. 137.—Bulbou3 arteriosus and portion of ventricle of lepidosteus. Shows the greatthickness of the bulb (a), and of the valves ib), between which tendinous bands run.— Original. Fig. 138.—Portion of bulbus arteriosus of basking shark. Shows the great thickness of thebulb (a) and of the valves (b), and how the latter support each other.— Original. The corpus Arantii is never present in a perfectly healthy semi-lunar segment; nor will its absence occasion surprise, when it is re-membered that its presence materially interferes with the folding ofthe segments upon themselves, wheD the valve is in action. Thatits existence is not necessary to the perfect closure of a semilunarvalve, is proved by its complete absence in the segments of thehuman pulmonic valve,
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