PLATE 1 
EXPLANATION OF FIGURES 
Fig. 6 A section through the shoulder girdle of a normal larva twenty-five 
days after the closure of the medullary folds. 
Fig. 7 A section through the glenoid cavity and the coracoid portion of the 
girdle of a normal larva. 
Fig. 8 A section through the shoulder region of individual Ba. 13, showing 
the effect on the girdle of the entire removal of the third, fourth, and fifth 
somites. 
Fig. 9 A section through the shoulder girdle of individual E. 2 developed in 
the absence of the rudiments of the suprascapula, scapula, and the limb (a-e X 
foetext: tee 1))), 
Fig. 10 A section through the shoulder region of individual H. 2 showing the 
absence of the central part of the girdle, the rudiment of which is removed in the 
extirpation of a typical limb bud (text fig. 1). 
Fig. 11 A section through the shoulder girdle of individual Ext. Gr. C. 19 
which developed after the removal of the rudiments of the ventral zone (a-e X 
4-8, text fig. 1). 
