The coracoid (ib. figs. 4, 5, 8 & 9, 52), averaging a length of 3 inches 7 lines, expands to a breadth of 1 inch 3 lines at its sternal end (52), of which the articular surface (_e_) occupies an inch; the non-articular part forms the outer angle (_m_), and extends in advance of the pneumatic foramen (Pl. IV. fig. 4, _p_) at that part of the breast-bone: the outer border which extends from this free angle to the body of the bone, into which it subsides, at one-third of the extent of the bone, is sharp; the inner border is obtuse to near the inner angle (Pl. VIII. figs. 4 & 5, _n_). The outer surface of the expanded sternal end is smooth and convex; the inner surface is flatter and more irregular, perforated by pneumatic foramina; the diameter of the subcylindrical part of the shaft is 4 lines: the extremes of difference in the distal expansion of the coracoid are shown in figs. 4 & 8, 52, Pl. VIII. A muscular ridge and rough surface (ib. fig. 9, _r_) mark the back part below the middle of the shaft. The bone then expands to its upper articular end, which is obliquely truncate from within outward: it shows, first, the oblong surface for the scapula, which is extended upon the inner prominence of that end; next, the larger and full oval surface for the humerus (_h_), from which the thick, obtuse, inner continuation of the scapular end projects inward, forward, with a slightly upward curve, and shows the narrow oblong surface for the articulation and ultimate confluence of the clavicle (58). The coracoid unites with the scapula at an angle of 100°. The clavicle (ib. figs. 4 & 5, 58), at its scapular end, is slightly expanded, compressed, with an obtuse recurved termination articulating with the above-named surface of the coracoid, and in one instance coalescing therewith, and by extended ossification with the “acromion scapulæ” (ib. figs. 8 & 9). As the clavicle descends it curves slightly and contracts to a point. The angle at which the pair meet is shown in figs. 4 & 5. _Bones of the Wing._ (Pls. III. & VIII. figs. 12–17.)