68 



DR. N. H. ALCOCK ON THE AMSCULAK 



[Feb. 1 , 



Fig. 5. 



Heart of Pteropus edulis, x2.— A poi-tion of the wall of the right ventricle 

 has been turned back to show the auriculo-ventrieular valve, the two 

 segments of which are seen. M. Moderator bnnd. 



Pig. 6. 



P.C. 



Heart of Pteropus edulis, x2. — The right auricle has been opened by the 

 usual incisions, and the whole of the wall of the right ventricle removed 

 vrith the outer segment of the auriculo-ventrieular valve ; the septal seg- 

 ment is seen in its whole extent. AO. Aorta. E.I. Eight Innominate 

 Artery. E.P.C. Eight Precaval Vein. P.O. Postcaval Vein; below this is 

 seen the opening of the Left Preciival. O.A. Conus arteriosus. The 

 attachments of the musculi papillares and moderator band to the septum 

 are shown. 



