EXPERIMENTS ON THE FORE LIMB OF AMBLYSTOMA 431 
procoracoid is also present, being represented by a small nodule 
of cartilage anterior to the ventral end of the suprascapula. 
The three cartilages are distinct from one another, but are 
connected by fascia or ligaments. 
A ease (E. E. 52) twenty-eight days old has a still heavier 
girdle, especially the ventral portion, which is almost as large 
as the normal. The; procoracoid is fused with the coracoid, 
and these two ventral elements are not separated very widely 
from the suprascapula, although the latter cartilage extends 
hardly so far ventrally as in E. E. 26. 
An individual which lived thirty-three days from the time of 
operation (EH. E. 71) shows the suprascapula very well devel- 
oped, reaching ventrally nearly to the level of the shoulder 
Fig. 14 Amblystoma larva (Experiment Tr. E. 53) from which the left limb 
bud had been removed and not regenerated; preserved eighty-seven days after 
operation; ventral view. ™X 5. 
joint. However, the ventral part of the girdle is relatively 
poorly developed in this case, the coracoid and procoracoid 
being small and still separated from one another. 
In a case preserved thirty-nine days after operation (Tr. E. 
62—) the dorsal portion of the girdle is well developed and at 
its ventral end enters into cartilaginous union with the pos- 
terior end of the procoracoid. The latter approaches close to 
the coracoid cartilage and is united to it by a strong ligamentous 
attachment, though there is no continuity of cartilaginous sub- 
stance. This is in contrast to E. E. 52, where the coracoid 
and procoracoid are fused and the suprascapula separate. 
The oldest case examined (Tr. Ext. 61—) was killed eighty- 
