BIRDS. 
151 
pebbles, and a coarse black powder, probably the remains of insects ; intestinal canal small ; 
caeca rudimental ; rectum large, becoming more expanded towards the cloaca, which is also 
large ; trachea of equal diameter throughout, furnished with one pair of sterno-tracheal 
muscles, a portion of each of which is continued downwards to the upper rings of the bronchi®, 
on which it expands ; liver two-lobed. 
inches 
Length of oesophagus, including proventriculus 3) 
of intestinal canal, from gizzard to cloaca ...... 18 
of rectum 2| 
inches 
Diameter of gizzard 
Length of ditto 1 
The pelvis and ribs of this bird were much damaged ; sternum of equal breadth posteriorly and 
anteriorly, slightly contracted on its lateral edge, near the middle indented on its posterior 
margin with four deep fissures, the outer ones largest; a large triangular process projecting 
forwards between the junctions of the coracoids, bifid at the apex ; the coracoids themselves 
very strongly articulated to the sternum, the sides of the sternum to which the ribs are arti- 
culated projecting in the form of a process far beyond the junction of the coracoids ; the 
sternal keel is narrow, and has its edge straight ; the coracoids are long, thin, with very 
slight external lateral processes at their junction with the sternum; os furcatum very thin, 
roundish, a very slight process on the point at which it approaches nearest to the sternum, very 
slightly arched. 
Scapula broad, flattened, much widened at about one-third of its length from the hinder extremity ; 
wing bones short, and weak ; leg bones long, and strong; the fibula much developed. 
lines 
Length of sternum 15 
Greatest breadth of sternum 9) 
Breadth at the narrowest part 7 
Width of external fissure 1| 
Depth of ditto 6 
Width of internal ditto 1) 
Depth of ditto 6) 
Depth of keel 3 
lines 
Length from occiput to point of bill 22) 
Breadth of cranium 10) 
Length of coracoids 11 
Breadth of scapula in the broadest part 2 
Cervical vertebrae 12 
Dorsal ditto 6 
Sacral, damaged. 
Caudal, damaged. 
PTEROTOCHOS ALBICOLLIS. Kittl. (Male.) 
Trachea, tongue, oesophagus, gizzard, and liver of the same form as in Pterotochos Tarnii. The 
contents of the gizzard also did not differ. 
inches 
Length of intestinal canal 14) 
from caeca to cloaca 2| 
inches 
Length of gizzard ) 
Breadth of ditto | 
Only the body, after skinning, of the species, was brought home by Mr. Darwin. 
The skeleton of this species does not differ in anything but admeasurements from that of 
Pterotochos Tarnii ; the pelvis, however, being so much damaged in that species, that I was not 
able to make many notes upon it, I shall give a description of that part in the present one. 
Pelvis of moderate size; the ossa pubis and ischium much expanded, and elongated posteriorly, and 
placed nearly perpendicular to the plane of the ilium, ischiatic foramina large ; two large 
processes arise on the ilium on each side of the junction of the caudal vertebrae for the attach- 
ment of the levator muscles of the tail. 
