1902.] ANATOMY OF THE CONDOR. '245 



the two hearts, this one and the heart described by Prof. Gegen-' 

 baur, were to be I'eprodnced in a composite drawing, we should in 

 all probability see a bird's heart with a right auriculo-venti'icular 

 valve as complete as is that of the Crocodile. It may be noted, 

 moreover, that in the Crocodile's heart (see the figures illustrating 

 the paper by myself and that by Dr. Mitchell and myself) the 

 portipn of the septal half of the valve which is nearest to the half 

 of the valve attached to the free wall of the right ventricle is 

 entirely muscular, the fibrous portion of the valve lying more to 

 the light. The comparison therefore becomes so far more exact. 

 A still further reduction of this already reduced representative of 

 the lower half of the septal flap of the valve might result in such 

 small muscular pillars, arising from the ventricular septum and 

 connecting together the two walls of the ventricle such as occur 

 in various birds, and which I have especially called attention to 

 in the heart of Ghunga in my paper already quoted. 



In addition to the heart of the Condor, I have had recently the 

 opportunity of examining the heart of another bird which shows 



B 



Heart of Soytlirops novtr-Jiollandiw cut open so as to display interior of 

 right ventricle. 



A, papillary muscle ; B, tendinous seam extending ft-om the same ; C, valve. 



some persistent traces, as I regard certain structures to be 

 described immediately, of the missing half of the right auriculo- 

 ventricular valve. The accompanying sketch (text-fig. 32) is a 

 drawing of the heart of a Cuckoo [Scythrops novce-hollctndice), 

 from which, as in the case of the Condor's heart just described, 

 the apex has been removed. The right ventricle is cut and 

 reflected, and the complete half of the valve shown without 

 further cutting. From the left half of the valve, which is attached 

 to the interventi'icular wall, a white seam runs down the ventri- 

 cular wall in the saiue direction as the piece of valve from which 

 it originates. Unfortunately, as will be seen from an inspection 

 of the sketch, the removal of the apex of the heart has destroyed 

 the actual ending of the seam. It could not end, however, very 



