96 



the fossa ovalis and the left auricular branch of the reticulum, under 

 the septal branch, and again appearing in the small triangular area, 

 as it is inserted into the central cartilage of the heart. These and 

 other points are indicated in Fig. 4, which is a key to this photo- 

 graph. 



Fig. 4. (Key to Fig. 3). a inferior cava turned up. & septal 

 branch of left coronary artery, which sends twigs to the reticulum 

 and the auriculo-ventricular bundle, c reticulum, d fibres from the 



c d e 



Fig. 3. 



Fig. 4. 



reticulum to ventricle and septal cusp, e insertion of muscular band Ä, 

 arising from left auricle and inferior cava, f superior cava, g fossa ovalis. 

 i left auricular branch of reticulum going to mouths of pulmonary veins, 

 auricular appendix, and coronary sinus, j coronary sinus, h branch 

 of reticulum going to right auricular appendix, now pinned to the 

 cut wall of the right ventricle. I left ventricle, m right auricle. 

 n branch from the reticulum to the interauricular septum and mouth 

 of superior cava, o central fibrous cartilage, p a twig of right septal 

 branch to conus arteriosus of right ventricle, given ofi" before the 

 remaining part enters the moderator band, q interventricular septum 

 seen from right ventricle. 



