478 



PROF. LANKESTER ON THE HEART OF APTERYX. [MaV 5, 



states that he dissected at the period iu question (more than forty 

 years ago) three specimens of Jpteryx ; and if I understand him 



Fis;. 1. 



Heart of the Common i' u\^ 1 ( Uallus do7nesticus). 

 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 (=uiuscuhis papillaris) into the free wall of the ventricle. The 

 dotted 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 iu 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 beheve that no mistake occurred in connection 

 with his drawings or preparations, and that the hearts of his three 



