Anatomy of Teratological Seedlings . IV. 463 
90° from their normal position, the phloems lying farthest from the line of 
cotyledonary fusion (Fig. 21). The two bundles unite by their protoxylems 
and form a mesarch mass almost surrounded by phloem (Fig. 22). At the 
apex of the hypocotyl the protoxylem is tending to assume an exarch 
position, and the phloem, which behaves in a curiously anomalous manner 
Figs. 1-15. Fig. 1. ‘Seedling A.’ A syncotyl combining tetrarchy at the base of the hypo- 
cotyl with extremely intimate syncotyly. Figs. 2 a, 2 b. ‘ Seedling B. 5 A syncotyl in which the 
hypocotyl is diarch; Fig. 2 b shows the venation of the compound lamina. Figs. 3, 4. Syncotyls 
showing tetrarchy. Fig. 5. A syncotyl showing a triarch hypocotyl; the tap-root was pentarch. 
Figs. 6 a, 6 b. Seedling with markedly unequal cotyledons. Fig. 7. A syncotyl with unequal 
cotyledons. Fig. 8. Large ‘ Type 2 ’ seedling in which the epicotyl has not developed. Figs. 9, 
10 a, 10 b. Salver-shaped amphisyncotyls, ‘ Seedlings C and D ’ respectively. Figs. 11-14. Goblet- 
shaped amphisyncotyls. Fig. 15. ‘ Seedling H.’ 
throughout, is creeping round the inner margin of the composite bundle 
(Fig. 23). At a slightly lower level it forms a U-shaped system as seen in 
transverse section, with a gap where the protoxylem is situated (Fig. 24). 
Meanwhile the marginal bundles of each cotyledon fuse and, after a brief 
downward course, end blindly. The lateral bundles, which also show 
H h 2 
