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. 



^esSS' 



a 



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



b. „ „ Mpyomis (?), from behind. 



Both i nat. size. 



In some of the broken femora referred to JE. titan the internal 

 structure can be well seen. The wall of the bone is very compact 

 and hard, and in the middle of the shaft it is 7 mm. thick. The 

 central cavity is very small, the bone being almost entirely filled 

 with a complex bony reticulum, the meshes of which are for the 

 most part more or less rectangular. If we compare this structure 

 with that found in Struthio and Dinornis, we find in each case 

 great variations, but of a different kind. 



8* 



