PLATE 4 
EXPLANATION OF FIGURES 
All of the figures are photographs of blotting paper reconstruction models of 
the shoulder girdle. The models were made at a magnification of 100 diameters 
and reduced one-half for publication. 
Fig. 23 Model of the left normal shoulder girdle of individual Ba. 13. 
Fig. 24 Model of the right shoulder girdle of individual R. 4 which devel- 
oped in the absence of the suprascapula rudiment. 
Fig. 25. Model of the right shoulder girdle of individual Ba. 13 developed in 
the absence oi the third, fourth, and fifth somites. 
Tig. 26 Model of the right shoulder girdle of individual E. 2 developed in 
the absence of the rudiments of the suprascapula, scapula and the limb (compare 
with fig. 9). 
Fig. 27. Model of the right shoulder girdle of individual H. 5 developed in the 
absence of the central portion of the rudiment which was removed along with 
the limb bud (compare with fig. 10). 
Fig. 28 Model of the implanted girdle of individual Tr. Ext. 154 developed 
from the central portion of the rudiment which was transplanted along with 
a typical limb dise (compare with fig. 21). 
Fig. 29 Model of the right shoulder girdle of individual Ext. Gr. C. 13 de- 
veloped in the absence of the rudiment of the ventral zone (compare with figs. 
11 and 12). 
Fig. 30 Model of the right suprascapula of individual Ext. Gr. C. 25 de- 
veloped in the absence of the limb and the remainder of the girdle (compare with 
fig. 13). 
Fig. 31 Model showing a very fragmentary girdle which developed, along 
with the limb, from the implantation of a small area of cells taken from the 
dorsal portion of the limb dise (compare with fig. 14). 
Fig. 32. Model of an implanted girdle from individual Tr. 2/v 10 which de- 
veloped in a heterotopic position from the transplantation of the ventral zone 
ot the girdle rudiment (compare with fig. 15). 
Fig. 33. Model of an implanted girdle from individual Tr. d/2 4 which de- 
veloped from the transplantation, along with the dorsal portion of the limb 
mesoderm, of the dorsal zone of the girdle rudiment (compare with fig. 16). 
536 
