44. KANSAS UNIVERSITY QUARTERLY. 
closes a small, oval foramen just back of the middle of the glenoid 
surface. The diameter of the foramen is about twelve millime: 
ters. 
The shaft of the coracoid is flattened antero-posteriorly in all the 
specimens, though probably in life ovai. On its proximal half 
there is a prominent process on the inferior border for muscular 
attachment. From beyond the middle the sides of the bone are 
parallel. The sternal articulation is gently concave in one direc- 
tion and slightly convex in the other, to agree with that of the 
sternum, forming a reciprocal joint, which must have had consider- 
able mobility. A little above the sternal end, on the posterior 
side, there is a narrow rugosity, more than an inch in length, for 
muscular attachment. 
The side to which a given bone belongs may be determined by 
holding the bone with the sternal end toward one and the glenoid 
articular surface looking obliquely upward; the scapular end will 
then be directed to its proper side. 
The bones have a close resemblance to those figured by Seeley 
in Ornithochetrus (Ann. Mag. Nat. Hist., 1891, 441.) Aba 
vertebra and sternum in this figure are, however, undoubtedly 
wrong. The ball of the centrum in this region does not have so 
much of the horseshoe shape, but is transverse, and undoubtedly 
the ribs are here stout and anchylosed to the centrum, 
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Distance between scapular and sternal articulations..170 
Greatest diameter suprascapular articular surface..... 25 
Humerus. 
The humerus is the stoutest bone of the body. Its proximal ar- 
ticulation, for union with the glenoid, is concave from side to side, 
convex in the other direction, with its width much greater on the 
ulnar side. Beginning at the head, the radial border slopes out- 
wardly with a gentle concavity, into a broad, rounded process. 
This process, the radial or deltoid, has its convex, rounded extrem- 
ity directed obliquely forward and upward or outward; the broad 
surface for muscular attachment, about two inches in length and 
one in breadth, is directed almost opposite to that of the glenoid 
