6 MARY L. WALKER ON THE FORM OF 
articulation. The pterygoid condyle is indistinct, and is represented by a slight 
hollow in the mass of bone above the internal aspect of the anterior mandibular 
articulation. The mandibular articulation surface is normal in character, and not 
unlike the Vulture’s. The external condyle of the posterior portion is bulky, and 
the anterior condyle is elongated. 
In the Solan Goose, the two capitula are separated by a deep groove, and the 
Fig. 9. SULA BASSANA. 
accessory head is faintly indicated. The anterior process is small and triangular. 
The quadrato-jugal cup is deep, with raised margins, and more remote than in the 
Pelican from the hinder border of the shaft of the bone. The pterygoid condyle is 
better marked than in the Pelican, but is still not distinctly raised from the surface 
of the bone. It possesses accessory smooth surfaces on its interior and posterior 
aspects, which are seen also in the Heron. The mandibular extension possesses on 
the outer side of its anterior condyle a conspicuous accessory trochlea. 
The quadrate of the Cormorant is very peculiar. The head is undivided, being 
merely crossed by a faintly indicated capitular groove, as in the Penguin. The 
Fig. 10, PHALACROCORAX CARBO. 
accessory head is perceptible. The shaft is long, and gives off, at night angles 
some distance below the head, a short, thick, and blunt anterior process. In place 
of a quadrato-jugal cup is a crescentic hollow so deeply excavated as to leave 
projecting above it a process of bone in line with the anterior process on the other 
side of the shaft. The pterygoid condyle is distinct. The mandibular articulation 
is exceptional, presenting two lateral surfaces parallel to one another, convex from 
before backwards, and separated by a deep trochlear groove. Thus the quadrate of 
the Cormorant, while simple and possibly archaic in character, is not without 
