32 TEETIAET VEETEBEATA OE THE FATtM. 



transverse processes situated near their anterior end. In the anterior caudals the 

 anterior and posterior faces of the centrum are inclined backwards. 



The exact number of vertebrae in the different regions of the vertebral column 

 is as yet unknown. 



A considerable number of scattered ribs have been found. The anterior ribs are 

 short and expand below into a large blade. The articulation is double and the 

 capitular surface has distinct anterior and posterior facets. In the mid-dorsal region 

 the head is large and prominent ; here also it has two facets making an obtuse angle 

 with one another, the anterior being the smaller. The tubercle is comparatively 

 small. The blade is flat behind and convex in front, with a slight groove along the 

 inner (anterior) margin. 



The sternum is unknown. 



Fore Limh. — The general form of the scapula is shown in text-fig. 15. It will be 

 seen that the prescapular fossa is much smaller than the postscapular : it is about 

 the same width throughout, owing to the fact that the anterior (coracoid) border [c.h.) 

 of the bone is nearly parallel with the spine (s.). The postscapular fossa is very 

 large : anteriorly, it is gently concave and is overhung by the spine which slopes 

 somewhat backwards ; towards the suprascapular border (ss.b.) the surface is somewhat 

 convex. The upper part of the coracoid border [c.b.) is slightly convex and is 

 separated by a deep bay or notch from the coracoid process (c). The suprascapular 

 border (ss.b.) consists of two convex portions, the smaller anterior one being over the 

 prescapular fossa, the larger posterior over the postscapular ; the two are separated by 

 a shallow concavity above the origin of the spine. The upper posterior angle of 

 the bone is prolonged considerably backwards and is rounded. The glenoid border 

 (g.b.) is concave, becoming more deeply so towards the glenoid cavity (g.c). The 

 coracoid process (c.) is stout and blunt, and is not separated from the anterior 

 angle of the glenoid cavity, the articular surface running on to its posterior face. 

 The glenoid cavity (g.c.) is an elongated oval (text-fig. 15, B), the long axis of which 

 is antero-posterior, in which direction it is deeply concave, forming nearly a qixarter 

 of a circle. Transversely there is scarcely any concavity, so that the articulation 

 with the humerus is almost cylindrical (see description of the head of the humerus 

 given below). 



The spine (s.) arises close to the superior border, and increases gradually in height 

 towards the glenoid cavity, about three centimetres above which its base terminates. 

 The superior border of the spine is prolonged downwards into a blunt acromion 

 process (a.) which slightly overhangs the glenoid cavity. The end of this process, 

 and indeed the whole of the free edge of the spine, is thickened and roughened. 

 As a whole, the spine is inclined somewhat backwards. The suprascapular border 

 is completed by an epiphysial cap, much roughened and rounded externally. 



The inner face of the scapula (subscapular fossa) is concave in front of, and behind, 



