[SERPENTARI2LE. 



VULTURID^I.] OSTEOLOGIA AVIUM. 



Circaetus, Vieill. 



Gallicus, Gm. 



Cranium as in Polyhorus, but rather broader in proportion to its length ; lacrymals 

 rounded at their extremities. 



Sternum with the posterior margin scolloped out for its whole width, more convex 

 than in Polyhorus ; the keel not extending to within an inch of the posterior margin, 

 the anterior point receding slightly ; manubrial process small, but well marked. 



Measurements. 



Tenths. 

 Length of humerus 65 



Length of ulna 76 



Length of radius .75 



Length of metacarpus 33 



Length of femur 33 



Length of tibia 54 



Length of metatarsus 38 



Length of sternum 35 



Tenths. 



Breadth of posterior margin of sternum 1 8 



Breadth of anterior margin of sternum 1 9 



Depth of keel 7 



Length of head 39 



Breadth of head 25 



Length of pelvis 31 



Breadth of pelvis 16 



Spilornis, Gray. 



Bacha, Baud. 



I have the bones of the wings, legs, and head of this bird, taken from a skin ; they 

 are precisely similar in shape to those of Circaetus gallicus. 



Subfam. 3. Serpentarin^e. 



Serpentarius, Cuv. 



Eeptilivorus, Baud. 



Type of Serpentarinse. 



Cranium broad in proportion to its length. Lacrymal bones broad, and not extending 

 far backwards over the orbits, which are very large. Orbital septum with a moderate- 

 sized rounded anterior perforation; foramen magnum placed nearly perpendicularly, 

 with the sides nearly straight, giving it a square appearance. Atlar tubercle large, 

 kidney-shaped. Upper surface of the cranium with a deep hollow between the orbits, 

 and a slightly-marked channel over the vertex to the occiput. Occipital ridge well 

 marked, with a deep impression below it on each side; upper maxillaries hooked at 

 their points, the edges very slightly waved. Palatine bones very broad posteriorly, 

 suddenly narrowed anteriorly ; inner edge bending slightly downwards from the posterior 

 angles, from which also arises a ridge slightly divaricating from the line of the inner 

 edge, and continued to the point at which the bones become narrowed. Interarticular 

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