1905. ] OSTEOLOGY OF THE EURYL/EMID#. 31 
presents an undoubted resemblance, in some respects, to the 
aberrant Procnias, in others to the Swallows. 
The following characters will, however, probably suffice :— 
The beak is of great size, nearly as broad as long, and joins the 
cranium by a more or less perfect nasal hinge; free lachrymals are 
wanting, save in Calyptomena; palate egithognathous; palatines 
short, broad, wide apart, and produced backward into prominent 
spurs; vomer truncated, much reduced and terminating posteriorly 
in a pair of slender limbs; pterygoids and palatines articulating 
by means of an oblique joint; maxillo-palatine processes reduced 
to long slender rods slightly expanding at their termination 
beneath the vomer; basipterygoid processes wanting; postorbital 
processes obsolete ; squamosal process prominent 
The Occipital Region. 
The foramen magnum is cordiform, its apex rising only slightly 
above the level of the superior margin of the rim of the tympanic 
cavity. The plane of the foramen inclines downwards rather 
than backwards, as in the Capitonide, but not to such an extent 
asin the Bucconide. The base of the foramen is not raised above 
the level of the basi-cranial axis. The supra-foraminal ridge is 
barely traceable. 
There is no lambdoidal ridge, such as is met with in the 
Capitonidee for example, but the cranium above the occipital 
foramen presents a fairly prominent cerebellar dome, bounded on 
either side by a subcircular depression (the supraoccipital fossa). 
Above this region the skull rises considerably and presents a 
gently rounded surface. 
The tympanic wings of the exoccipital are considerably developed 
to form a pair of downwardly directed plates, the processus ale 
exoccipitalis inferior, having a convex border and a convex surface 
with recurved free edge: through these plates the semicircular 
canals can be faintly traced. 
The Cranial Roof (Pl. 11.).—The cerebral rises vertically above 
the cerebellar dome and is of considerable width, being wider than 
long. In regard to the position of the cerebral with relation to the 
cerebellar dome, the Kurylemide agree with the typical Passeres 
and the Cypseli, and differ from the Capitonide, for example, 
wherein the cerebral les tm front of the cerebellar dome. The 
parietal region is marked by a moderately well-defined temporal 
depression, the “‘ temporal fossa,” which, however, does not extend 
further inwards than the outer margin of the supraoccipital fossa. 
This is a Passerine feature; in the Coraciiformes these fossee 
usually meet in the middle line, forming a more or less well- 
marked sagittal crest. 
The temporal fossee in the Eurylemide are mainly responsible 
for the formation of the well-marked squamosal prominences. 
The interorbital region is marked with a more or less distinct 
median groove, sometimes with alow ridge. Immediately behind 
