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



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specimens did actually present the characters of structure in the 

 right cardiac valve which he descrihed and figured. 



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



Fig. 3. 



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



Common Fowl's heart drawn in fig. 1. 



The muscular baud a has the same relations as in fig. 1, but is shorter and 



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



line X indicates the course of tlie cut which was subsequently made aud 



allowed the reflection of the ventricular 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 effected, and the ventricular wall with the attachment of 

 the muscular valve reflected. 



existence, and have heen exhumed hy Dr. Garson from among the 

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



