STUDIES OF THE MACROCHI11ES. 
829 
wide and capacious, though not at any point correspondingly 
deep. The first three or four sacral vertebrae throw out their 
lateral processes to abut against the nether surface of the ilia, 
on either side, their extremities co-ossifying with the same ; 
while the leading vertebra of all of the sacrum, as I have already 
said above, supports a pair of freely articulating ribs. A strong- 
pair of lateral processes come off from the sacrum opposite the 
acetahulse, and by abutting against the inner pelvic walls just 
above these circular apertures, they form strong braces to this 
part of the pelvis. Other members of the class frecpiently pos- 
sess this feature. Now the posterior border on either side of 
this pelvis shows scarcely any mark to distinguish the union of 
the ilium and ischium, beyond a slight elevation at the usual 
point ; in some birds, as we are aware, a notch defines the 
place. 
Among the coccygeal vertebrae of the tail the transverse jn’o- 
cesses are all long and spreading, the last three being con- 
spicuously so. Their neural spines are low and not prominent ; 
while only the ultimate vertebra supports a bifid hypapophysis 
beneath its centrum. 
To complete my account of the axial skeleton of a Trogon, it 
may be noted that the pygostyle is of arhomboidal outline, with a 
considerably thickened base, and a perforation in its plate-like 
part near the supero-anterior angle. 
Of the Appendicular skeleton ; the Pectoral Limb (PI. XIX. 
figs. 12-14). — No very striking feature distinguishes the humerus 
of one of these birds from the same bone as we find it in a 
considerable number of the Passeres. It seems to be thoroughly 
pneumatic, and the fossa that harbours the foramina occupies its 
usual site, and is surrounded in the usual manner by the ulnar 
crest at the proximal extremity of the bone. 
The radial crest is rather low ; its free border being long and 
convex, and the plate itself being bent palmad, as we so commonly 
find it among Passerine birds. 
Coming to the shaft, we find it to be of a subcylindrical form, 
somewhat compressed laterally, and possessing the usual sigmoid 
curve, only in a moderate degree. 
Nothing worthy of special record marks the distal extremity 
of this humerus, it being tuberous only to an extent in harmony 
with the general size of the bone ; and upon its palmar aspect 
