Chionid^s.] 



OSTEOLOGIA AVIUM. 



[TlNOCHORIN^E. 



Tenths. 



Length of humerus 31 



Length of ulna ....... 35 



Length of metacarpus ..... 21 



Length of femur ...... 24 



Length of tibia 23 



Length of metatarsus 19 



Length of sternum 27 



Measurements. 



Tenths. 



Breadth of posterior margin of sternum 12| 

 Breadth of anterior margin of sternum 14 



Depth of keel 9 



Length of head 26 



Breadth of head 10 



Length of pelvis 24 



Breadth of pelvis 15 



Attagis, Less. 



Gayii, Less. 



Cranium rounded, a slight channel between the orbits ; nostrils oval ; occipital crest 

 and protuberance very well marked. Palatine bones not expanded for so long a dis- 

 tance as in Chionis, but only for a short distance beyond their junction with the inter- 

 articular bones. Orbital septum with two foramina, a large one below, rounded, and 

 narrow one immediately above it. 



Sternum broad, with a single, rather broad but not deep, fissure on each side of the 

 keel ; strip of bone bounding them slightly expanded at the tip ; keel deep, scolloped 

 out, particularly near the point, lower edge rounded ; manubrial process similar to that 

 in Chionis. 



Pelvis also similar to Chionis, but much broader. 



Ribs weak, with styliform or pleural processes pointing upwards. 



Furculum similar to Chionis, but with a very slight process at the junction of the 

 rami. 



Coracoids very short. 



Scapula slightly expanded towards the tip, which is rounded, and blunt. 



Leg-bones. Metatarsus with a hind toe; calcineal ridge scarcely perceptible. 



Measurements. 



Tenths. 



Breadth of posterior margin of sternum 14 

 Breadth of anterior margin of sternum 1 1 



Tenths. 



Length of humerus ..... 21 



Length of ulna 24 



Length of metacarpus 13 



Length of femur 12 



Length of tibia 22 



Length of metatarsus 11 



?th of sternum ...... 26 



Depth of keel . 8 



Length of head ....... 19 



Breadth of head 



Length of pelvis 21 



Breadth of pelvis 16 



H 



Illustrations. 

 Sternum, pelvis, palatine bones, and metatarsi, Plate XXI. fig. 3. 



2b 



177 



