206 MR. RUDOLF MARTIN ON A FOSSIL | Mar. 3, 
The trochanter and the line aspere of the proximal end of the 
femur are not to be distinguished from the same parts in the 
recent Ostrich ; even the pneumatic foramen in the caudal surface 
is found in the same place. 
The middle part of the bone is just as in S. camelus, nd the 
distal end differs only in one particular: the fossa intercondy- 
loidea is much elongated, so as to form a slight valley in the distal 4 
or 2 of the rostral surface of the femur. In the caudal surface, 
immediately above the proximal border of the trochlea, there is 
also a funnel-shaped pneumatic foramen which enters the bone 
obliquely (from the mesial border of the bone, and is directed 
towards the middle of the axis of the trochlea). As in the recent 
Ostrich, there is a tuberosity between the wide orifice of that 
foramen and the mesial edge of the caudal surface. 
The pelvis (text-figs. 32-34) differs in some respects rather 
considerably from that of the recent Ostrich; but the individual 
Text-fig. 33. 
Pelvis of Struthio karatheodoris. Worsal view. 
variation met with in the recent form, and very probably also in 
the fossil, shows that the difference is much less than it seemed to 
be at first sight, and very probably the extreme variations of 
the two forms closely approach. 
