46 MR. W. P. PYCRAFT ON THE [May 2, 
should rather be described as blade-shaped, the dorsal edge of the 
blade being much thickened ; in other words, the ventrally placed 
keel of the triangle seen in Corydon has in this genus extended 
downwards, The median line of the dorsal surface of the corpus 
sterni is deeply grooved, and pierced anteriorly by a large 
pneumatic foramen. In Cymbirhynchus, and to a less extent in 
Calyptomena, the groove is laced across by narrow, irregular bars 
of bone. 
The carina is deep, and has the free (ventral) edge produced 
forwards, The anterior (vertical) border bears a hollow groove for 
the reception of the hypocleideum. 
The coracoid grooves look directly forwards, and do not meet in 
the middle line. The dorsal lips are prominent and thickened ; 
the ventral lips are well-defined, but have knife-like edges con- 
tinued inwards on to the spina eaterna. 
Text-fig. 13. 
Sternum of Calyptomena, showing the simple (unbifurcated) spina externa, s.e. 
a.l.p., anterior lateral process; c., carina; p.l.p., posterior lateral process. 
The coracoids are long; as long as, or longer than, the corpus 
sterni. The procoracoid process, though reduced, is still moderately 
large, and forms a narrow flange of bone, arising beyond the 
middle of the coracoid shaft and having its free edge directed 
downwards, Cephalad it articulates with the scapula, and with 
the clavicle forms the foramen triossewm. The procoracoid of the 
Eurylemide is larger than in the Cotingide. In the Picide the 
procoracoid appears to be wanting, and in the higher Passeres it 
is reduced to the merest vestige, e.g. Corvus. The breadth of the 
base of the coracoid is increased by narrow phalanges of bone, one 
on either side extending forwards, for about one-fourth the length 
of the shaft. On the dorsal aspect of the shaft a prominent 
tongue of bone is sent up to abut against the dorsal lip of the 
coracoid groove. This at least obtains in Calyptomena; in 
Corydon and Cymbirhynchus it is less marked. 
The scapula is long, narrow, and scimitar-shaped. The furcula 
