TEliTIARY VERTEBRATA OF TITE EAYtTM. 
r,2 
transverse ])r()cesses situated near their anterior end. In the anterior caudals the 
anterior and ])osterior faces of tlie centrum are inclined backwards. 
d'lie exact numher of vertehne in the different regions of the vertebral column 
is as yet unknown. 
A considerable number of scattered I'ihs have been found. The anterior ribs are 
short and expand below into a large blade. 'J'he 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 
witli one anotlier, 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 scaimla 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 (s's.^.) the surface is somewhat 
convex. The upper part of the coracoid border {c.h.) is slightly convex and is 
separated by a deep bay or notch from the coracoid process (c.). The suprascapular 
border {ss.h.) 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 
{q.h.) 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, II), the long axis of which 
is antero-posterior, in which direction it is deeply concave, forming nearly a quarter 
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). 
'I'he spine (6‘.) arises close to the superior border, and increases gradually in height 
tfjwards the glenoid cavity, about three centimetres above wdiich its base terminates, 
'file superior border of the S])iue is prolonged down^vards into a blunt acromion 
])rocess {a.) which slightly overhangs the glenoid cavity. The end of this ])rocess, 
and indeed the whole of the free edge of the spine, is thickened and roughened. 
As a whole, tlie spine is inclined somewliat backwards. 'The su])rascapular border 
is completed by an epiphysial cap, much roughened and rounded externally. 
The inner face of the sca])ula (suhscapular fossa) is concave in front of, and behind. 
