768 DR. J. HECTOR ON CNEMIORNIS CALCITRANS. [DeC. 2, 



the bone is less than 3 lines. The impression (d) for the attach- 

 ment of the pectoral muscle extends from the exterior angle of the 

 coracoid notch towards the posterior part of the keel, including a 

 triangular area which occupies only one sixth of the exterior surface 

 of the bone, showing the extremely limited and feeble attachment of 

 the third muscle of flight. Large pneumatic foramina exist in the 

 interior of the bone at the upper angles, and one (i) on the exterior 

 surface .on the- left side only. 



Furcula. (Plate LXVII. fig. 3.) 



The clavicles are completely joined into a smooth, slightly com- 

 pressed furcula like that of the Swan, except that the antero-pos- 

 terior curvature is confined to the articular processes, which diverge 

 1 inch above the general plane, and are expanded, with a large pneu- 

 matic foramen (a) on the internal surface, overhanging which is a 

 triangular cotyloid surface (6). The coracoids have not been found, 

 but must have been stout triangular bones 2 inches in length, and 

 1 g inch wide at the sternal attachment. The scapula also is wanting. 



Vertebra. 



The following vertebrae have been found: — the third, fourth, 

 seventh, eighth, ninth, tenth, thirteenth, fourteenth, fifteenth, and 

 sixteenth cervical, the first and two middle dorsal, and a single 

 prsesacrah which differs iu the absence of an inferior spinous process. 

 The total number of vertebrae seems to have been — 



Cervical 16 



Dorsal 7 



Praesacral 3 



Sacral 17 



The total length from the tip of the beak to the coccyx would be 

 about 35 inches. 



Ribs. 



The third, fourth, and fifth ribs of the right side, the sixth and 

 seventh of the left, and also the seventh sternal rib of the same side 

 have been preserved. The first six ribs have well-pronounced un- 

 cinate processes, with a broad attachment 1 inch in length, that 

 on the sixth rib being bent backwards so as to be almost parallel 

 with the bone, and having a blunt expanded tip. The ribs are 

 much compressed, with thin margins, having wavy irregular outlines. 

 They are broad in the middle, and taper off towards each extremity 

 when viewed laterally. 



Humerus. (Plate LXV.) 



The humerus has already been described, so far as it differs from 

 the bone attributed to Cnemwrnisby Professor Owen ; and the femur, 

 tibia, and tarso-metatarse agree so perfectly with Professor Owen's 

 description as to require no further notice. 



