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Show 346 MESSRS. F. E. BEDDAED AND P. CHALMEES MITCHELL [May 7, Fig. 2. Heart of Alligator, opened to display the right ventricle and the origin of left aorta. a &b. T w o rows of rudimentary valves, the row opposite b being shorter and having a deep pit under the lowest of three chief rudimentary valves. c. Septal flap of right auriculo-ventricular valve; the membranous area is dotted, and a strong muscular band ties d o w n the lower end of the flap to the septal wall. d. Fleshy half of right auriculo-ventricular valve . e. Muscular band tying down junction of two flaps, and corresponding to bridge in bird's heart. |