Falconid^.] 



OSTEOLOGIA AVIUM. 



[Aquiline. 



Haliaetus, Sav. 



Albicilla, Linn. 



Cranium scarcely distinguishable from that of Aquila; the whole head, however, is 

 larger and stronger, and the foramen magnum more square. The sternum is much 

 longer in proportion to its width than in Aquila, but in other respects similar. Pelvis 

 precisely similar, except in size, the present one being the largest. 



In the remaining bones I cannot perceive any difference in structure between Haliaetus 

 albicilla and Pandion Haliaetus, except in the proportional measurements. 



Measurements. 



Tenths. 



Length of humerus 85 



Length of ulna ♦ . . 97 



Length of metacarpus 43 



Length of femur 49 



Length of tibia 65 



Length of metatarsus 40 



Length of sternum 57 



Tenths. 

 Breadth of posterior margin of sternum 25 

 Breadth of anterior margin of sternum 27 



Depth of keel 8 



Length of head 47 



Breadth of head 25 



Length of pelvis 52 



Breadth of pelvis 22 



Illustration. 

 Pelvis, Plate II. fig. 2. 



Haliaetus, Sav. 



Leucocephalus, Linn. 

 Not differing in structure from the last. 



Measurements. 



Tenths. 



Length of humerus 83 



Length of ulna 97 



Length of radius 91 



Length of metacarpus 41 



Length of femur 45 



Length of tibia 57 



Length of metatarsus 34 



niustrations. 

 Metatarsus, Plate II. fig. 1. I 



Tenths. 



Length of sternum 62 



Breadth of posterior margin of sternum 29 

 Breadth of anterior margin of sternum 28 



Length of head 55 



Breadth of head 27 



Length of pelvis 60 



Breadth of pelvis 24 



Skeleton in Plate I. 



Haliaetus, Sav. 



Leucogaster, Gm. 

 The bones were obtained from a skin : the whole of the top of the head very much flat- 

 tened, more so than in albicilla ; the other bones are precisely similar in form, but weaker. 

 14 



