CHI0NID2E.] OSTEOLOGIA AVIUM. [ChIONINJE, 



Leg-bones. Femur rather long in proportion to the tibia ; metatarsus with a very 



rudimentary hind toe. 



Measurements. 



Tenths. 



Length of humerus ..... 1 9 



Length of ulna 22 



Length of metacarpus 12 



Length of femur ...... 20 



Length of tibia 31 



Length of metatarsus 21 



Length of sternum . ..... 40 



Tenths. 



Breadth of posterior margin of sternum 3 

 Breadth of anterior margin of sternum 10 J 

 Depth of keel ....... 7j 



Length of head 25 



Breadth of head 7 



Length of pelvis 31 



Breadth of pelvis 17 



Illustrations. 

 Palatine bones, sternum, and pelvis, Plate XXVI. fig. 2. 



Chionis, Forst. 



Alba, Forst. 



Cranium with a very small cavity for the brain ; occipital ridge very prominent ; at 

 the base of the bill two tuberosities, with large foramina behind them, communicating 

 with the orbits ; a sharp ridge between these foramina. The proper name of these 

 foramina, or their use, I do not know; I have never seen a recent specimen. Palatine 

 bones very broad for their hinder halves, turned somewhat downwards on their inner 

 edges; hinder edges rounded on the exterior margin; ridges for the attachment 

 of the masseter muscles strongly-marked ; nostrils large, oval ; orbital septum with one 

 large nearly central foramen. 



Sternum rather long ; posterior fissures small, the outer one largest ; keel very deep, 

 scolloped out in front, arched on its interior edge. Manubrial process small, and short, 

 bifurcate at its upper extremity. 



Pelvis with the processes of the central vertebra? not covered by the ilium, rather 

 narrow ; ischiadic foramen very large, oval. Obturator large in the centre, diminishing 

 into a mere slit behind; a slight indentation on the posterior margin of the ischium. 

 Os pubis extending beyond the ischium. 



Bibs slender ; styliform processes long. 



Furculum very similar to that of Tinamus, but quite circular at the junction of the 

 rami, without any process, and not approaching very near the sternum, and rather 

 more flattened. 



Coracoids very short. 



Scapula of moderate length, very slightly expanded near the centre, the tips rounded. 



Wing-bones of moderate length ; the ulna slightly longer than the humerus; meta- 

 carpal bones long. 

 Jjeg-bones. Metatarsus with a small hind toe ; calcineal process quite rudimentary. 



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