8 MARY L. WALKER ON THE FORM OF 
In the Buzzard the two capitula are still further apart, and the external one is 
the longer of the two; the pterygoid condyle is more prominent, and the quadrato- 
Fig. 11. Burzo vuuearis. 
jugal cup (oval in form) is placed lower down. The mandibular articulation 
resembles the Vulture’s. 
In the Owl, the capitula are yet more widely and more deeply sundered ; and 
the quadrato-jugal cup resembles that of the Buzzard. But the pterygoid condyle 
Fig. 1%. Srrrx aLuco. 
is very faintly marked, and the anterior portion of the mandibular articular surface 
possesses an external accessory trochlea. We do not propose to discuss on this 
slender basis the moot point of the relationship of the Owls, beyond merely 
emphasising the fact that their quadrate differs greatly from that of the true 
Aétomorphe. The Vulture in general outline suggests resemblance to the 
Geranomorphe, but the mandibular articulation is very different in the two. On 
the whole, the likeness to the Gull’s quadrate is most striking, and is borne out by 
the character of the mandibular articulation, and by the situation of the quadrato- 
jugal cup. 
VI.—PsitrAcoMORPHA. 
The very peculiar shape of the Parrot’s quadrate is well known. The shaft 
Fig. 13. Cacatua. 
