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Show 720 MR. F. E. BEDDARD ON THE [Dec. 4, ance as diagnostic of the Monotreme heart than the fact of the greater muscularity of the valve. This conclusion was obAaously warranted by the facts discovered by Prof. Lankester; but the heart of Ornithorhynchus is more variable, apparently, as regards this valve than would be inferred Fig. 2. Testis and vas deferens of Ornithorhynchus. t, remains of testis. s, sac in which it is enclosed. m, membrane attaching this sac to vas deferens (Sp). n, membrane attaching sperm-duct to body-wa 11. from Prof. Lankester's paper. The first of the two hearts which I dissected was, at first sight, almost exactly like that figured by Prof. Lankester in fig. 14 of plate xl. of his memoir. The muscle " 6 " was single and there was a small membranous septal flap |