MAMMAL-LIKE REPTILES. 765 
articulation with the precoracoid. Behind this it thickens and 
forms the upper part of a glenoid cavity which looks outwards 
and slightly backwards. 
The precoracoid (P.C., text-fig. 11) is a very large bone arti- 
culating by a long suture with the scapula and bearing a long 
articular face for the coracoid. It is pierced by a foramen which 
opens into a distinct pit on the visceral surface. The coracoid 
(C., text-fig. 11) is a large bone which has a long surface for 
contact with the precoracoid, and whose upper anterior corner 
articulates with the scapula. Behind this contact it forms the 
lower portion of the glenoid cavity, which is entirely formed by 
the scapula and coracoid. 
Text-figure 13. 
Y <K ( 
NX 
aN 
‘ ys : \ 
BW Nana 
| 
Sacrum and pelvis of the type-specimen of Phocosaurus megischion Seeley ; 
seen obliquely from front. + nat. size. 
Iz., [lium ; Is., Ischium; Pu., Pubis; 8., Sacrum. 
The humerus (text-fig. ]2) is a very massive bone with expanded 
ends which are in planes at a considerable angle to one another. 
The head is cylindrical and directly continuous with the enormous 
deltoid crest, which, after extending more than halfway to the 
distal end of the bone, suddenly subsides into the shaft. The 
52* 
