430 ROSS G. HARRISON 
° 
of the normal suprascapula, which it undoubtedly represents 
in rudimentary form. The pronephros had been removed in 
this case so that the relation to this organ could not be exactly 
determined. 
S.Sc. 
HUM. 
IZ 13 
Figs. 12 and 13 Outline of shoulder girdle cartilages of an embryo (Experi- 
ment E. BE. 59), from which the fore limb bud had been removed on the right side 
and had not regenerated. Specimen preserved twenty-seven days after opera- 
tion. From a total preparation of the shoulder region. X60. The cartilages 
are represented in lateral view projected upon the sagittal plane. COR., cora- 
coid; HUM., humerus; P.COR., procoracoid; SC., scapula; S.SC., suprascapula. 
Figure 12. Operated right side. Figure 13. Normal left side. 
Another specimen (E. E. 26), preserved twenty-four days 
after operation, shows both the dorsal and ventral elements 
much better developed. The suprascapula is a long rod of 
cartilage extending from near the level of the n. lateralis ventrally 
almost to the level of the glenoid cavity of the unoperated side. 
The coracoid is more massive than in the previous case. The 
