Otidje.] osteologia avium. [Tinaminjl 



Measurements (continued). 



Tenths. 



Length of sternum 39 



Breadth of posterior margin of sternum 23 

 Breadth of anterior margin of sternum 20 

 Depth of keel 10± 



Tenths. 



Length of head 39 



Breadth of head 15 



Length of pelvis 50 



Breadth of pelvis 30 



Illustrations. 



Skeleton, Plate I. J. Palatine bones, sternum, pelvis, and metatarsus, 



Plate XXVI. fig. 1. 



Tinamus, Lath. 



Major, Linn. 



Differs very much in the form of the skeleton from Otis. I have not, however, all 

 the bones. 



Cranium with the parietal bones somewhat abruptly elevated above the occipital. 

 Palatine bones similar to those of Otis, but with anterior portion broader in proportion. 

 Interarticular bones long, flattened perpendicularly. Orbital septum with two 

 foramina — one large one at base, another elongated one at the upper part. 



Sternum very long ; two very large foramina extend almost for the whole length 

 of the sternum, bounded exteriorly by two long, narrow splints, which are much curved 

 inwards to their tips, and nearly meet ; central portion of the sternum very narrow ; 

 keel not scolloped out on its anterior edge. Manubrial process triangular, broadest at 

 its junction with the sternum, pointed at its extremity, a slight ridge along the upper 

 surface ; lower edge of the keel slightly arched, rather shallow. 



Pelvis broad, of a very peculiar form, the divisions of the vertebrae distinct when 

 held up to the light ; upper surface rounded, broad. Ischium divided from the ilium, 

 by a broad and deep fissure extending almost to the acetabulum ; ischiadic foramen 

 bounded below by the ischium, which is represented by a narrow strip of bone, gradually 

 expanding towards the tip ; os pubis consisting of a long thin strip, broader at anterior 

 part than at its posterior, and extends beyond the ischium ; a large blunt spine anterior 

 to the acetabulum. 



Ribs. The few I possess have the styliform process broad and short, and are rather 

 weak. 



Furculum flattened perpendicularly at upper extremities, and gradually rounded to 

 the junction of the rami; they approach one another with a very wide semicircular 

 sweep ; there is no vestige of a process at their junction. 



Scapula long, arched slightly, expanded in the centre, and blunt at the extremity. 



Wing-bones short; ulna much bent, which gives a large space between it and the 

 radius, 



175 



