454 ROSS G. HARRISON 
May 27. The limb is bidigitate or bifurcated. 
June 1. Limb is short, hand reduplicated and digits irregular. 
June 6. Specimen preserved. 
The double hand (fig. 44) is approximately symmetrical. The pos- 
4-5 
Figs. 44 and 45 Larvae with supernumerary limbs developed from inoculated 
mesoderm (continued). X 74. Figure 44. Experiment Tr. Mes. 18. Super- 
numerary limb with double hand; PRIM., primary member, a right, developed 
from left-handed mesoderm; DUPL., reduplicating members; eighteen days after 
operation. Figure 45. Experiment Tr. Mes. 19. Supernumerary limb with 
double hand; PRIM., primary member a left, developed from right-handed meso- 
“derm; DUPL., reduplicating members; forty days after operation (development 
very slow). : 
terior member (PRIM.), which, judging by the first direction of point- 
ing, is the primary one, is a right, the original laterality having been 
reversed. The first two digits are normal, the third is distinct, and the 
fourth a slight eminence. The other member (DUPL.) is not so far 
developed. The first two digits are webbed and the first consider- 
