Falcootd^:.] osteologia avium. [Aquiline. 



Perms, Cm. 



Cristata, Guv. 

 The body of this bird is in the British Museum, sent there by Mr. Hodgson. Sternum- 

 short, without any fissure or foramen on its hinder margin ; the inferior edge of the 

 keel rounded. Furculum very much arched. Pelvis of moderate length, and very much 

 expanded on its anterior extremity. 



Length of humerus . 

 Length of ulna . . 

 Length of radius . . 

 Length of metacarpus 

 Length of femur . . 

 Length of tibia . . 

 Length of metatarsus 

 Length of sternum . 



Measurements. 



Tenths. 



28 



Tenths. 



Breadth of posterior margin of sternum 16 

 Breadth of anterior margin of sternum 15 

 Depth of keel 8 



Length of head 



Breadth of head 



Length of pelvis 30 



Breadth of pelvis 15 



Subfam. 5. Aquiline. 



Aquila, Moehr. 



Chrysaetos, Linn. 



Type of Aquilinse. 



Cranium more elongated in proportion to its width than in Falco ; orbits flattened 

 above, much rounded posteriorly; large orbital process of the frontal bone much 

 lengthened. Septum of the orbits with one anterior foramen. Foramen magnum of 

 moderate size, placed nearly horizontally. Upper surface of the skull depressed, with 

 a slight longitudinal impression on the vertex, and a strongly marked transverse one at 

 the junction of the nasal bones ; occipital ridge and protuberance slight. Nasal orifices 

 posteriorly narrow and gradually expanding forwards, somewhat triangular. Upper 

 maxillaries very much hooked at their extremities, the lateral line slightly waved. 

 Palatine bones similar in general character to Falco, but more truncate posteriorly and 

 broader anteriorly in proportion to their hinder expansion ; interarticular bones very . 

 similar to those of Falco, but more expanded; condyles of the occipital bones more 

 developed than in Falco. 



Sternum more convex than in Falco ; keel not extending to the posterior margin ; 

 anterior edge receding considerably ; ridge for the attachment of small pectoral muscles 

 very small ; that of the great pectoral well defined ; posterior margin nearly straight ; no 

 foramen or fissure. Manubrial process strong, short, slightly compressed laterally. 



Pelvis similar to Falco, but with the posterior lateral ridge of the ilium more deve- 

 loped, and with a deeper impression above the cotyloid cavities. 



c2 11 



