478 
Holden and Daniels . — Observations on the 
the symmetrical amphisyncotyly of the subject of the present observations. 
A section towards the base of the cotyledons shows three somewhat flattened 
mesarch double bundles with which the laterals have either united or are 
converging to do so (Fig. 81). At a slightly lower level the flattening of the 
double bundles is more pronounced, and the cotyledonary axillary buds are 
Figs. 81-88. Figs. 81-83 illustrate the earlier stages of transition in an amphitrisyncotyl (Figs. 13 <2, 
13 b, 13 c) ; Figs. 84-88, the earlier stages of transition in a tricotyl. 
evident, two of the three showing partial union to form a tangentially 
elongated structure (Fig. 82). One pair of laterals (Figs. 81, 82, /, /'), after 
uniting with their respective midribs, separates again and unites in the inter- 
cotyledonary plane to form a collateral endarch group, which, however, dies 
out in the hypocotyl. The three main bundles, which at this level are 
