2G8 



Mons. A. Milne-Edwards on the 



metatarsus, several tibiae have been found which seem as if they 

 ought to be referred to the same bird ; for a study of the pecu- 

 liarities they offer leads to the same result as the examination 

 which I have just been making of the osteological characters of 

 the bone of the foot. 



The fossil tibiae (figs. 7, 8) are remarkable for the want of 



thickness of the diaphysis com- 

 Figs. 7, 8. pared with the articular extre- 



mities ; the shaft of the bone 

 is in fact nearly cylindrical, 

 more slender below the pero- 

 ncan ridge than at its lower 

 extremity, and it presents a 

 slight concave curvature in- 

 side. The peronean ridge is 

 somewhat strong, and is pro- 

 longed to the upper third of 

 the bone. The fibula would 

 seem to have terminated a 

 little below the lower third, as 

 is indicated by the rugosities 

 which exist at this point. 



The upper extremity is large 

 and rounded, the anterior 

 tibial ridge advances a good 

 deal and curves outwards ; but 

 it is very little elevated above 

 the articular surface. The ro- 

 tular ridge is but little marked, 

 and the outer tibial ridge is 

 prolonged outwardly in curv- 

 ing round in front of the pe- 

 ronean. 



The lower extremity is mas- 

 sive ; the two condyles are very 

 unequal, that of the inner side 

 is narrow and advanced, that of 

 the outer is broad and romuUd, the groove which separates 



