English: Skull of adult Fowl. Here the temporal fossa is bridged over by the junction of the post-frontal and squamosal processes (pf., sq.). The processes of the mandible (iap, pap) are characteristic of this type, and of the anseres.

a, Angular of mandible.
ar, Articular.
bt, Basi-temporal.
d, Dentary.
eo, Lateral occipital. eth, Ethmoid.
f, Frontal.
iap, Interangular process of mandible.
ios, Interorbital septum.
j, Jugal.
l, Lacrymal.
mx, Maxillar.
n, Nasal.
os, Orbito-sphenoid.
p, Parietal.
pa, Palatine.
pap, Posterior angular process of mandible.
pe, Ethmoid.
pf, Post-frontal.
pg, Pterygoid.
ps, Pre-sphenoid.
px, Premaxilla.
q, Quadrate.
qj, Quadratojugal.
sa, Supra-angular or coronoid.
so, Supra-occipital.
sq, Squamosal.
ty, Tympanic cavity.
v, Vomer.
1, Exit of olfactory nerve.

Illustration from 1911 Encyclopædia Britannica, article Bird