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Show 478 PROF, LANKESTER ON THE HEART OF APTERYX. [May 5, states that he dissected at the period in question (more than forty years ago) three specimens of Apteryx ; and if I understand him Fig. 1. Heart of the C o m m o n Fowl (Gallus domesticus). The right ventricle is opened by a nearly horizontal cut which runs above (i. e. nearer the auriculo-ventricular ring than) the insertion of the muscular band (=musculus papillaris) into the free wall of the ventricle. The clotted line x indicates the course of a subsequently effected cut which set free the part of the ventricular wall into which the muscular band is inserted, and allowed the band to be reflected, as shown in fig. 2. Fig. 2. The same heart as that drawn in fig. 1 ; the cut x having now been made, and the ventricular wall with the attached muscular band a reflected. aright, he is inclined to believe that no mistake occurred in connection with his drawings or preparations, and that the hearts of his three |