Plate XR'. Tlie Origin of tho Anthophyta. 



Figure 14. Seed of Bennettites. (After Solms-Laubach from Coulter and C'l^iani- 

 berlain.) 



Figiu'e 15. Part of leaf of Sphenopteris. (After Stur, from Coulter and Cham- 

 berlain.) 



Figure 16. Part of leaf of Pecopteris, bearing seeds. (After Grand 'Eury from 

 Coulter and Chamberlain.) 



Figure 17. Hypothetical gymnospermous flower of early ancestor of Antho{)hyta. 

 (From Arber and Parkin.) 



Figure 18. Hyj^othetical angiospermous flower of somewhat later step in evolution 

 of Anthophyta. (From Arber and Parkin.) 



