1905. ] OSTEOLOGY OF THE EURYLEMID#. 49 
metacarpal ITT. In the Eurylemide this spur is, however, much 
larger than in the Coraciiform genera referred to. 
The humerus only is pneumatic; and is subequal to, or shorter 
than, the manus. The forearm isthe longest segment of the limb. 
The sulcus transverswm ov covaco-humeral groove is shallow. The 
crista superior is triangular in form. 
The incisura capitis is fairly sharply defined; the fossa 
subtrochanterica is large. There is a small ectepicondylar process, 
which, it is to be noted, is not forked as in the higher Passeres ; 
the entepicondylar process is still smaller. Ventrad of the 
tuberculum ulnare is a prominent spur-like blunt-pointed tubercle 
directed backwards and outwards so as to interlock with the 
olecranon process of the ulna in the extended wing. 
On the palmar surface immediately above the radial condyle is 
a small tubercle for the attachment of the inner head of the 
extensor metacarpi ulnaris. 
The ulna has a prominent, pointed, olecranon process, and bears 
a row of small tubercles, for the attachment of the secondary 
remiges, along its postaxial border. 
The radius is slender and slightly bowed. The forearm is the 
longest segment of the wing. 
The manus is well developed. As in the Capitonide and the 
normal Passeres, the base of Me. II. sends backwards a bony 
plate to overlap and fuse with the base of Mc. III. In the 
EKurylemide this plate (intermetacarpal plate) is of considerable 
size, 1ts base extending down the shaft for some distance. 
In some Coraci, e. g. Hurystomus, there is also an intermeta- 
carpal plate, but feebly Abvalieea! and not fused with Mc. IIT. 
ix. Tae Petyvic Limes. 
The pelvic limb, in the Eurylemidze, has, in common with the 
Cotingidee, a syndactyle pes ; and in this respect these two families 
resemble many of the Coraciiformes. None of the bones are 
pneumatic ; in which respect the Eurylemide differ from the 
Cotingide, which have a pneumatic femur, and resemble many of 
the Coraciidee. 
The femur islongand slender. The popliteal fossa is represented 
only by a shallow depression. 
The tibio-tarsus has moderately well-developed ecto- and ento- 
cnemial crests and a long fibular crest. The shaft is curved first 
forwards, then inwards, so that the distal end thereof is markedly 
inflected. The extensor bridge is ossified. The intercondylar 
gorge is deep. The fibula extends to below ple level of the middle 
of the shaft of the tibio-tarsus. 
The tarso-metatarsus is moderately long. The hypotarsus is 
complex. The distal end of the shaft is flattened from before 
backwards, and laterally expanded to form the condyle for digits 
II-IV. These condyles all extend forwards to practically the 
same level, the middle condyle scarcely projecting beyond the level 
Proc. Zoou. Soc.—1905, Vor. II. No. 1V 4 
