SYMMETRY IN TRANSPLANTED LIMBS 37 
ally on the anterior side of the orighial (figs. 49 to 55 and 01). 
When the latter condition arises and the anterior reduplicating 
member is sufficiently developed, it is seen that it, too, is mirrored 
from the original member and is homopleural (fig. 55). In one 
case there are three complete hands, one of which has two of its 
digits doubled.^'- The plane from which the posterior redupli- 
cating member is mirrored in the final form of the limb varies 
from radial to dorsal (figs. 3 and 4) and is usually intermediate 
between these two extremes (p. 13). Nineteen cases follow 
this rule, three are indeterminate and there is only one positive 
exceptional case, in which the mirror plane is ulnodorsal.^^ When 
there is also an anterior reduplicating member, it is generally 
mirrored from a plane 180° around the limb axis from the first; 
i.e., ulnar, ulnopalmar, or palmar. 
The reduplications belonging to the second group are more 
restricted and less certain of diagnosis. The limb bud retains its 
original prospective asymmetry, reaching an approximately nor- 
mal position by rotation, and reduplication is much less extensive, 
involving in most cases the digits only (fig. 62). Three cases'*^ 
almost certainly belong to this group, and there may be two 
others. ^^ 
Of the two remaining cases of reduplication, one died too 
young; in the second^*' the supernumerary limb was of the same 
side as the primary and was quite distinct from it. This is a 
very unusual condition, but the transplanted bud in this case was 
Figs. 49 to 55 Orthotopic transplantation; left limb bud to left side inverted 
ihom.dv.), resulting in limb with two reduplicating members. Exp. I. E. 63. 
N , normal right limb bud; TR, transplanted left bud; PR, primarj^ limb; A.DU, 
anterior, and P. DU, posterior reduplicating members. X 10. 
Fig. 49 Dorsal view, four days after operation. 
Fig. 50 Lateral view, four days after operation. 
Fig. 51 Dorsal view, seven days after operation. 
Fig. 52 Lateral view, seven daj's after operation. 
Fig. 53 Dorsal view, ten days after operation. 
Fig. 54 Lateral view, ten days after operation. 
Fig. 55 Dorsal view of specimen preserved seventeen days after operation. 
Gills (BR) removed to show limb. 1 to 3, numbers of digits. 
« L E. 87. "' J. E. 72. » I. E. 8G, -88, 90. « L E. 41, .59. "« L E. 38. 
