Zoological Society. 



523 



} 



Length of the body of the "I 

 sternum . . . : j 



Length of the lateral wings. . 



Length of its keel 



Length oftheensiform process 



Length of the sternal apophysis 



Half the breadth of the bone 1 

 at its superior margin . . / 



Height of the keel at the su- 1 

 perior part / 



Projection of the keel, su- 

 perior to the body of the 

 sternum 



Length of the os coracoides. . 



Length o£ the scapula 



Breath of the scapula at its 1 

 neck j 



Breadth near its inferior angle 



or, in integral parts, the length of the centre of the sternum being 

 taken as unity : 



Aptenodytes. 



Length of the middle of the "I 



sternum / 



Length of the lateral wings. . 



Length of the keel 



Length of the ensiform process 

 Length of the sternal apophysis 

 Breadth of the superior margin 



Height of the keel 



Projection of the keel above "I 



the body of the bone . . J 

 Length of the os coracoides . . 



Length of the scapula 



Breadth at its neck 



Breadth at its inferior angle. . 



•* The humerus is much flattened. On its posterior aspect there 

 is a large foramen, situated under, and occupying the whole of the 

 internal part of its head, which is in form crescentic from before 

 backwards : over the internal and posterior part of it a groove 

 passes. The distal end of the bone has two tubercles for articula- 

 tion. There are two prominent trochlea? on its posterior surface, on 

 which work the two sesamoid bones of the elbow-joint. The form 

 of the larger of these is flattened, and of the smaller trapezoid, with 

 truncated edges. 



" The ulna is very thin and flat, not quite so long as the humerus^ 

 rounded slightly at its upper extremity, and still less at its lower 

 one. Its head has a cavity, which receives the posterior tubercle of 



3U2 



1+ 

 -r^n. 



T 



-?■§• 



lxVn. 



