EXPLANATION OF PLATES. 



PLATE I. 



Fig. 1. Palreopteris Hibernica, Schiinper (Cyclopteris Hibernica, 



Forbes). One-sixth the natural size. 

 Fig. 2. A pinnule somewhat magnified, showing the venation. 

 Fig. 3. A fertile pinna, natural size. 

 Fig. 4. Two cup-shaped indusia borne on the rachis. 

 Fig. 5. Sporangia enclosing spores. From the Coal-measures. 

 Fig. 6. Sporangia of Hymenophyllum Tuubridgense, Sm. (Fern of 



present epoch.) 

 Fig. 7. Sporangium of Polypodium vulgare, Linn. (Fern of present 



epoch.) Figs. 5, 6, and 7, magnified to the same extent. 

 Fig. 8. Transverse section of Osmundites Dowkeri, Carruthers. 

 Fig. 9. Two cells of Osmundites, filled, the one with starch granules, 

 and the other with mycelium of a fungus. 



PLATE n. 



Fig. 1. Cycadeostrobus ovatus, Carr. From the Wealden, Isle of 

 Wight. 



Fig. 2. Beania gracilis, Carr. From the Yorkshire Oolite. 



Fig. 3. Bennettites Saxbyanus, Carr. From the Lower Greensand of 

 the Isle of Wight. 



Fig. 4. Pinites Leckenbyi, Carr. From the Lower Greensand of the 

 Isle of Wight. 



Fig. 5. Trigonocarpon olivseforme, Lindl. and Hutt. From the Coal- 

 measures, Manchester. 



Fig. 6. Trigonocarpon sulcatum, Carr. Coal-measures, Wardie, Edin- 

 burgh. 



Fig 7. Sequoiites Gardner!, Carr. Erom the Gault at Folkestone. 



Figs. 8, 9. Cupressinites Thujoides, Bowerbank. From the Eocene 

 at Sheppey. 



Fig. 10. Scale of Ai'aucarites Brodiei, Carr. From the Great Oolite 

 at Stonesfield. 



