256 
PROFESSOR H. G. SEELEY ON THE STRUCTURE, ORGANIZATION, 
and the bone widens in a wedge-shape as it curves backward and inward. The 
externa] surface is concave from side to side, and the internal surface is convex in 
the same direction. The posterior margin is thickened, and the anterior margin 
compressed, and both these margins are concave in length. The free end of the bone 
appears to be convex from side to side. 
The bone figured by Sir R. Owen as the scapula of Dicynodon leoniceps (‘ South 
African Catalogue,’ Plate 70, fig. 1) is essentially of the same type, but with the 
wedge-like blade relatively more expanded towards its extremity. The posterior 
border appears to be thickened, and the anterior margin is compressed and thin ; but 
the acromion is not seen, probably because only the internal aspect of the bone is 
exposed, and the proximal part of the anterior border is invested in matrix. The 
internal or visceral aspect is bow-shaped in length, and the strong concavity may 
be supposed to correspond with tlie external curvature of the ribs. The bone is 
28 centims. long. Its proximal end is thickened, and 11 centims. wide. It is 
divided by a short deep notch or groove into two articular parts, a posterior portion 
about 7 centims. wide, which gave attachment to the coracoid l^one, which is not 
preserved, and an anterior part over 4 centims. wide, which articulated with the pre¬ 
coracoid, a bone represented in Sir R. Owen’s figure, but described as coracoid. It 
is stated that the coracoid exemplifies the broad and short type with the large 
“axillary” perforation (p. 35). But, although this specimen is described as the 
articular end of the right scapula with “ the coracoid,” it seems to me that the entire 
length of the scapula is preserved, though the proximal anterior corner of the bone is 
broken away. The pre-coracoid is imperfect, and too imperfectly preserved to give 
any idea of its shape. The anterior margin is very thin. Opposite the perforating 
notch in the scaj^ula is a corresponding large U-shaped notch in the pre-coracoid, 
which appears to be what is commonly termed the coracoid foramen. It is about 
2’5 centims. deep and 2 centims. wide. 
Another specimen, No. 36,272, I regard as the left scapula and pre-coracoid, both 
very imperfect and exposing the external surface of both bones. The scapula is only 
preserved as far as the acromion process, which curves forward and downward, so 
making a flattened transverse surface for the clavicle to rest upon. It encloses a 
space between the clavicle and pre-coracoid. The scapular articulation is greatly 
thickened, semi-circular, transver.se to the external surface ; and the internal surface 
for the coracoid widens the bone into a laro^e sub-triano-idar mass. There is no 
external indication of division between the pre-coracoid and coracoid surfaces of the 
bone, except that the pre-coracoid plate is obviously compressed and thin. The 
clavicle is sigmoid, expanded at the ends, wdiich are at right angles to each other. 
