Zuulogical Affinities 0/ Aphanapteryx. 



265 



Fiff. 5. 



Fig. 6. 



marked in its upper portion, while it is completely effaced be- 

 low; none of the projecting lines 

 which bound the insertional sur- 

 faces of the extensor muscle of the 

 hallux, of the abductor of the inner 

 toe, and of the adductor of the outer 

 toe, are to be seen. The tibial im- 

 pressions are unequal, the inner 

 one being more elevated and much 

 stronger than the outer ; they are 

 surmounted by a slightly deep im- 

 pression, at the bottom of which 

 open the superior orifices, the outer 

 one being placed much higher than 

 the inner. Within there is seen, 

 bounded by two little ridges, a fur- 

 row, which lodges the tendons of 

 the common exterior muscles of the 

 toes. The posterior surface of the 

 bone of the foot is rounded, and 

 traversed longitudinally by clearly 

 defined intermuscular lines. The 

 surface of the attachment of the 

 flexor muscle of the hallux is but little marked. 



The upper articular extremity is somewhat narrow ; and the 

 glenoid facets ax'e placed at different levels, that of the inside 

 being higher than that of the opposite. They are separated by 

 a strong intercondylian tuberosity, at the base of which a some- 

 what deep depression (whereto the semilunar ligament is at- 

 tached) is seen on the outside. The heel is partly broken ; 

 however, it may be seen that it was but slightly projecting, and 

 that it was only grooved inside by very superficial furrows. 

 The digital trochlese are strong and placed at different levels. 

 The median is the longest, and is broad, much arched, and hol- 

 lowed by a deep groove; a very open slope separates it from 

 the outer trochlea, which is much shorter and very broad. The 

 inner trochlea is the smallest, and terminates on a level with the 

 base of the middle one; it is much thrown back. The depth of 



