88 Bexon . — Observations on the Anatomy of 
cotyledons, and a third which showed fission of the lamina for a short 
distance. Each half of this abnormal cotyledon was supplied by a collateral 
vascular bundle, the two bundles in spite of the early fusion of the halves of 
the lamina remaining distinct and widely separate throughout the whole 
cotyledon, and finally entering the hypocotyl quite independently. At the 
apex of the hypocotyl the four bundles were grouped in pairs, each pair 
consisting of one bundle from the split cotyledon, and one connected with 
a normal cotyledon. 
The bundles of the two normal cotyledons commenced to rotate, 
followed by the bundles of the split cotyledon (Fig. 8 , b ). Bundle D was 
Fig. 7. a-f. Hemitetracotyl D. 
somewhat smaller than the others and quickly fused with bundle B, so that 
a triarch stage resulted. Later the bundles c and A gradually approached 
one another and finally fused, the phloem group situated between the two 
xylem groups passing over and fusing with the other phloem group of C 
(cf. Compton (3), Ulex europaeus ), so that ultimately the hypocotyl and root 
showed a normal diarch structure (Fig. 8 ). In this case, therefore, the 
vascular bundles which supplied the lobes of the bifid cotyledon fused not 
with one another but with the bundles A and B respectively which supplied 
the normal cotyledons. 
Seedling D . This possessed two cotyledons, of which one presented 
a normal appearance, whilst the other was approximately twice the size of 
its fellow, and showed at its apex a slight notch and also a deeper cleft 
which extended for almost half the length of the lamina, each of the three 
lobes so produced being supplied by a vascular bundle (Fig. 7 a). The two 
