BIRDS. 1<'>I 



pebbles, and a coarse black powder, probably the remains of insects ; intestinal canal small ; 

 ceeca rudimental ; rectum large, becoming more expanded towards the cloaca, which is also 

 large ; trachea of equal diameter throughout, furnished with one pair of stemo-tracheal 

 muscles, a portion of each of which is continued downwards to the upper rings of the bronchiae, 

 on which it expands ; liver two-lobed. 



inciies 



Length of oesopha^s, including proventriculua 3\ 



of intestinal canal, from gizzard to cloaca .^.... 18 



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 

 maroin 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 aie 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 ; 

 wino- bones short, and weak ; leg bones long, and strong; the fibula much developed. 



Length of sternum 15 



Greatest breadth of sternum 9J 



Breadth at the narrowest part 7 



Width of external fissure I3 



Depth of ditto 6 



Width of internal ditto 1| 



Depth of ditto % 



Depth of keel 3 



Length from occiput to point of bill 2'2j 



Breadth of cranium 101 



Length of coracoids 11 



Breadth of scapula in the broadest part 2 



Cervical vertebroe 12 



Dorsal ditto 6 



Sacral, damaged. 

 Caudal, damaged. 



Length of gizzard 

 Breadth of ditto . . 



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 14i 



from caeca to cloaca -\ 



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 vertebra for the attach- 

 ment of the levator muscles of the tail. 



