PECTORAL SKELETON OF TELEOSTEANS. 367 
larger, and is situated just ventral to the middle of the 
glenoid line (fig. 3 a. m.), and halfway between the scapula 
and postcoracoid process. 
The preecoracoid process has undergone no change beyond 
a relative increase in size and a slight median rotation. 
The postcoracoid process also is slightly larger, and is now 
in a straight line with the precoracoid process. 
Stage III (figs. 4 and 5).—Hitherto the fin-plate has 
tended to be the dominant feature of the pectoral skeleton, 
but now it has yielded to the girdle. Both regions are still 
continuous, and the line between them horizontal. ‘They are 
both orientated in the same way as in Stage II, though the 
hinder half of the fin-plate has begun to turn in such a way 
as to face somewhat posteriorly. 
In the fin-plate the first radial element (7) has become a 
separate piece of cartilage. Another fenestra has appeared 
in the centre of the plate, and depressions on either side of 
it indicate the position of future fenestre. ‘hus the four 
radials are blocked out. 
Along the distal border of the second and third radials 
three nodules of cartilage have been differentiated. ‘These 
are the distal radials. The first two belong to the first radial, 
the third distal to the third radial. There is a close similarity 
in everything but size between these distal elements and the 
first radial. 
The scapulo-coracoid has now grown round the nerve and 
blood-vessel which lay in front of it, and thus the scapular 
(fn. 1—8) and precoracoid (f. b.) foramina have been 
formed. In consequence of this growth the large space 
which formerly existed between the coracoid and cleithrum 
(cl.) has almost disappeared. 
The mesocoracoid process (fig. 5, m.), though still small, is 
larger than before. Owing to the growth of the coracoid it 
is no longer situated close under the glenoid line. The 
apparent’ reduction of the preecoracoid process is due to the 
fact that its proximal portion has been taken up into the 
extending coracoid. ‘I'he distal portion is remarkably slender, 
