16 ILLUSTRATIONS 



PLATE FACING PAGE 



XI-XIX. Dinosauria 510-518 



XX. Dinosauria-Crocodilia 519 



XXI. Mollusca 520 



XXII-XLI. Pteridophyta 521-540 



XLII-LVIII. Cycadophytse 541-557 



LIX-LXXVIII. Gymnospermae 558-577 



LXXIX, KXXX. Monocotyledonse 578, 579 



LXXXI-XCVII. Dicotyledons 580-596 



FIGURE PAGE 



1. Sketch map of the world showing the approximate location of out- 



crops containing Lower Cretaceous plants 150 



2. Restoration of a frond of ScMzceopsis americana Berry, about four- 



fifths natural size 218 



3. Sketch map of the world showing the Mesozoic and existing distri- 



bution of the family Matoniacese 234 



4. Restoration of Sagenopteris elUptica, about natural size 288 



5. Transverse section of a partly emergent but still folded frond of 



Cycadeoidea ingens' deeply embedded in ramentum, X 4 314 



6. Sketch map of the world showing the approximate distribution of the 



existing cycads 315 



7. Restoration of an unexpanded bisporangiate strobilus of Cycadeoidea 



with some of the bracts removed, about one-fourth natural size. . . . 317 



8. A. Radial longitudinal section of an ovulate strobilus of Cycadeoidea, 



somewhat -reduced 318 



B. Semi-diagrammatic longitudinal section of a bisporangiate stro- 

 bilus of Cycadeoidea, about one-half natural size 318 



9. Two views of the type of Williamsonia virginiensis, one-half natural 



size (after Fontaine) 319 



10. Cuticle of Dioonites Buchianus viewed from within, X 385 334 



11. Cross-sections of fronds of Nilsonia densinerve. A, showing method 



of fossilization of specimen shown on Plate Ivii, Fig. 1, natural size. 

 B, diagrammatic cross-section of specimen shown on Plate Iviii, Fig. 

 1, natural size 363 



12. Sketch map of the world showing the approximate distribution of 



the existing Taxacese 376 



13. View showing the whole midrib and the cuticle of one-half the lamina 



of Cephalotaxopsis magnifoUa, X 110 378 



14. View of a preparation of the epidermis of Frenelopsis ramosissima . . 423 



15. Sketch map of the world showing the segregation of the existing 



Actinostrobinse and the Mesozoic occurrences of Frenelopsis and 

 Widdringtonites 427 



