1894.] 



IN THE BRITISH MUSEUM. 



115 



imperceptibly into the posterior face of the shaft. Into the 

 popliteal fossa several pneumatic foramina open, the largest 

 measuring 7 by 5 mm. 



The condyles, which are very massive, are broken away in 

 front; the outer projects considerably below the inner. Their 

 lateral surfaces are concave and rough. The intercondylar fossa 

 is scarcely perceptible and the surface for the fibula is narrow. 



Fig. 2. 





r' ^..- 



a. Left femur of Mpyornis titan (?), from behind. 

 h. „ „ Mpyornis (?), from behind. 



Both ^ nat. size. 



In some of the broken femora referred to 

 structure can be well seen. The wall of the 

 and hard, and in the middle of the shaft it 

 central cavity is very small, the bone being 

 with a complex bony reticulum, the meshes 

 most part more or less rectangular. If we c 

 with that found in Stfuthio and Dinornis, 

 great variations, but of a different kind. 



JE. titan the internal 

 bone is very compact 

 is 7 mm. thick. The 

 almost entirely filled 

 of which are for the 

 ompare this structm'e 

 we find in each case 



8* 



