Menu rid je. ] 



OSTEOLOGIA AVIUM. 



[Menurin^:. 



inner margin of each is continued back to the interarticular bones, which are very- 

 slender, but rather elongated. 



Sternum very slightly convex, broad posteriorly, the margin nearly straight, with 

 two fissures, one on each side ; the end of the external strips of bone expanded poste- 

 riorly; the lateral margin slightly contracted at the sides at about one-third of its 

 length ; devoid of any manubrial process. Keel with the inferior margin slightly 

 curved, not reaching to the posterior margin of the sternum. 



Pelvis broad in proportion to its length, the acetabula placed rather forward ; upper 

 plane slightly convex ; ilium overhanging the ischium slightly at the sides. Os pubis 

 and ischium elongated very much beyond the iliac bones. Obturator foramen of 

 moderate size ; ischiadic foramen very large. 



Ribs weak, styliform process broader at its junction with them than at its tip, which 

 projects beyond the next rib. 



Furculum with the rami very slight ; a very slight tubercle at its junction with the 

 sternum. 



Coracoids long in proportion to the length of the sternum, and not much expanded. 



Scapula long, narrow, longer than the humerus, reflected at their points. 



Wing-bones very short ; humerus not so long as the ulna ; metacarpal bones long, 

 united. 



Femur slightly bent ; tibia without any process on their inner side ; fibula very short, 

 not extending for above one-fourth of the length of the tibia. 



Vertebral column of moderate size ; the penultimate and three following vertebra? 

 with dorsal processes; the terminal caudal one triangular. 



Measurements. 



Tenths. 



Length of humerus ..... 5 



Length of ulna 5 j 



Length of metacarpus .... 3 



Length of femur 5 J 



Length of tibia . . . - . . . • 10 



Length of metatarsus .... 8J 



Length of sternum 5 



Tenths. 



Breadth of posterior margin of sternum 4 



Breadth of anterior margin of sternum 3 



Depth of keel . 1 J 



Length of head 11 \ 



Breadth of head 5 



Length of pelvis 7 



Breadth of pelvis 5 



Illustrations. 



Sternum, pelvis, metatarsi, Plate XV. fig. 2. 



100 



