STIJDTES OF THE MACROCHTRES. 



329 



wide and capaciou^^, though not at any point correspondingly 

 deep. The first three or four sacral vertebrae tlirovv out their 

 lateral processes to abut against the nether surface of tlie 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 

 acetabulae, 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 frequently 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 pro- 

 cesses are all long and spreading, the last three being con- 

 spicuously so. Their neural s])ines 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 t\\Q py go style is of arhomboidal outline, with a 

 considerably thickened base, and a perforation in its plate- like 

 part near the supero-anterior angle. 



Of tJie Appendicular skeleton ; the Pectoral Llinh (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 j)osscssing 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 



