EXPLANATION OF PLATES. 



(N.B. — The figures are very diagrammatic.) 



PLATE I. 



Fig. I. Longitudinal section through the embryo of ^£««^W//«.f ^i^jtf«za««i-. a = 

 plumule; <J = radicle; f = cotyledons. ("Scott. Fossil Botany," 6th 

 edition, 1900, fig. 150.) 



Fig. 2. Radial section through fruit of Bennettites gibsonianus. re. = receptacle ; 

 (5r. = bracts which oveilap at the top; j. =seeds borne on longitudinal 

 pedicles, arising from the receptacle, showing dicotyledonous embryos ; 

 /. = dilated ends of inter-seminal scales, which become confluent to form 

 the pericarp. ("Scott. Fossil Botany," 6th edition, 1900, fig. 148.) 



P"ig. 3. Longitudinal section through the flower of Magnolia yulan, to illustrate 

 general arrangement of floral organs, and for comparison with Bennet- 

 tites gibsojtiamis. (After Baillon, "Nat. History of Plants," fig. 167.) 



Fig. 4. Eiiocaulon ? porosum, Lesqx. Lower Eocene, Sand Creek, N. America. 

 (After Lesquereux, "The Tertiary Flora," 1878, pi. xvi. figs. 2, 2rt. ) 

 Transitional between Cretaceous and Tertiary. 



[The author wishes to acknowledge his indebtedness to Messrs. A. & C. Black, 

 Lovell Reeve, and The Macmillan Co. for permission to copy figures from works 

 by Dr. D. II. Scott, Bentham and Hooker, and Strasburger respectively.] 



.JlOg^ 



