inches 



Diameter of gizzard f 5 



Length of ditto 1 



BIRDS. 1 5 1 



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 bronchia?, 

 on which it expands ; liver two-lobed. 



inches 



Length of oesophagus, including proventriculus 3^ 



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



of rectum 2J 



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 11 



Depth of ditto 6 



Width of internal ditto l\ 



Depth of ditto 6| 



Depth of keel 3 



lines 



Length from occiput to point of bill 22J 



Breadth of cranium 10J 



Length of coracoids 11 



Breadth of scapula in the broadest part 2 



Cervical vertebras 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 Tamil. The 

 contents of the gizzard also did not differ. 



inches 



Length of intestinal canal 14J 



from caeca to cloaca 2J 



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 Tamil ; 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. 



