SYMMETRY IN TRANSPLANTED LIMBS 61 
ventral part, which. forms the glenoid cavity, is in fore and aft 
symmetry, with a coracoid and procoracoid process i)ointing in 
each direction. The posterior half of this cartilage has almost 
certainly developed in connection with the grafted limb and is 
reversed, while the anterior half is derived from the host. 
In the disharmonic cases which have reduplicated limbs, the 
shoulder-girdles are on the whole less regular, owing to the com- 
plex articulations of the double appendages. One of them^^ 
(hom.dv) is, however, similar to the one first described in having 
two entirely separate girdles, one derived from the host and one 
from the graft. The suprascapula, procoracoid, and coracoid 
of the former are separate chondrifications, situated directly 
opposite the corresponding parts of the normal limb. The 
girdle of the transplanted limb has a broad flat glenoid cavity for 
articulation with the massive humerus. There is a large coracoid 
running ventrally from the joint, though without any very well- 
marked procoracoid. This girdle is placed some distance pos- 
terior to that of the host. Another of these cases''^ (hom.dv) is 
more like the second case described above, inasmuch as the dorsal 
element (suprascapula) is separate, while the two coracoids 
(from host and graft, respectively) are fused. The procoracoid 
of the host is a separate cartilage in this case. Two other cases*^ 
are of the same general type with fused coracoids, though they 
are rather too young to show all characteristics. Again, two 
others*"' have two scapulae with coracoids fused. There is onlj' 
one case" that shows in sections practically no sign of doubling 
of the girdle, though even in this the coracoid region is thicker 
than normal and the glenoid cavity is large in correspondence 
with the more massive humerus. 
To sum up: The shoulder-girdle in orthotopically grafted 
limbs is derived in part from the host and in part from the 
transplanted tissue. The former portion retains its normal asym- 
«3 1. E. 81. 
6^ I. E. 93. 
«^ I. E. 68 {hu77i. dr.) and R. E. 129 {het dd.). 
«6 R. E. 77 (het. di'.) and R. E. 96 {het. dr.). 
6M. E. 00 (h»»i. dr.). 
