1885.] PROF. LANKESTER ON THE HEART OF APTERYX. 



47-9 



specimens did actually present the characters of structure in the 

 right cardiac valve \vhich he described and figured. 



Fortunately Sir Richard Owen's specimens of Apteryx are still in 



Fig. 3. 



Heart of Apteryx australis, Ow., with the right ventricle opened as in the 



Coiumon Fowl's heart drawn in fig. 1. 



The muscular band a has the same relations as in fig. ], but is shorter and 



broader, owing to the contraction of the specimen in alcohol. Tbe dotted 



line X indicates the coiu-se of tlie cut which was subsequently made aud 



allowed the reflection of the Tentricular wall, as shown in fig. 4. 



Fig. 4. 



The same heart as that drawn in fig. 3. The cut along the dotted line x of 

 fig. 3 has been eifected, and the Tentricular wall with the attachment ol' 

 the muscular valve reflected. 



existence, and have been exhumed by Dr. Garson from among the 

 stores of the Museum of the Royal College of Surgeons. Dr. 



