Fm. i. 
0. Durobrivensis. 0 Phillipsi. 0. Armatm. 
In this figure the left femoral hones are reduced to the same absolute length 
to show the differences of proportion in their proximal and distal ends. By the 
omission of a line in contour of the distal articulation there is an appearance of 
difference in 0. durobrivensis which does not exist. 
the British Museum. The Slingsby fossil differs from the 
Oxford clay type, which has the femur nearly 40 inches long, 
in having the proximal end relatively rather narrower, and 
relatively wider below the articular surface, in so far as can 
he judged from the present state of preservation. The 
trochanteric ridge does not appear to have been prolonged so 
far proximally. The distal end is relatively much narrower, 
and the articular surface on the front of the shaft is 
similar. These differences seem to me consistent with 
reference of the Slingsby fossil to a different and smaller 
