have successively occupied the surface of the Earth. 201 



Wealden formation exclusively, are, among the Ferns, the rarity 

 of the Ferns with reticulated nervation, so numerous in the lias ; 

 among the Cycadese, the frequency of the Otozamites and Zamites, 

 properly so called, that is to say, of the Cycadaces most analo- 

 gous to those now existing ; and the diminution of Ctenis, Ptero- 

 phyllutn and Nilsonia, genera very far removed from living kinds ; 

 lastly, the greater frequency of the Conifers, Brachyphyllum and 

 Thuites, much more rare in the lias. 



4. Wealden Epoch. 



Amphigenous Cryptogams. 



Alg^. 



Confervites fissus,Z)MnA;. — Germany. 



Acrogenous Cryptogams. 

 Ferns. 



Pachypteris gracilis, Brong. — En- 

 gland, Beauvais. (Sphenopteris 

 gracilis, Fitt.) 



Sphenopteris Mantelli, Brong. — En- 

 gland, Germany. 



Sillimani, Mant. — England. 



Romeri, Dunk. — Germany. 



tenera, Dunk. — Germany. 



Phillipsii, Mant. — England. 



Gopperti, Dunk. — Germany. 



Hartlebeni, Dunk.- — Germany. 



longifolia, Dank. — Germany. 



Adiantites Mantelli, Brong. — Germ. 

 (Cyclopteris Mantelli, Dunk.) 



? Klipsteinii, Brong. — Germ. 



(Cyclopt. Klipsteinii, Dunk.) 



Cladophlebis Albertsii,J5roM^. — Ger- 

 many. (Neuropteris Albertsii, 

 Dunk.) 



Pecopteris Huttoni, Brong. — Germ. 

 (Neuropt. Huttoni, Dunk.) 



Geinitzii, Dunk. — Germany. 



Murchisoui, Dunk. — Germany. 



Conybeari, Dunk.— Germany. 



elegans, Brong. — Germany. 



(Alethopt. elegans. Dunk.) 



polydactyla,DM/iA:. — Germany. 



Ungeri, Dunk. — Germany. 



gracilis, Dunk. — Germany. 



Cordai, Dunk. — Germany. 



Althausii, Dunk. — Germany. 



Brovvniana, Dunk. — Germany. 



? linearis, Sternb. — Germany 



(non P. Reichiana, Brong.). 



Lonchopteris Mantelli, Brong. — En- 

 gland. Beauvais. 



? Huttoni, Presl. — Germany. 



Ann. (Sf Mag. N. Hist. Ser. 2. 



Dunk. 



Hausmannia dichotoma, 



Germany, 

 Protopteris? erosa, Ung. — England. 



(Endogenites erosa, Mant.) 



Marsileace^. 



Baiera Huttoni, Brong. — Germany. 



(Cyclopteris digitata, L. Si' H., non 



Brong.) 



Brauniana, Dunk. — Germany. 



• nervosa. Dunk. — Germany. 



EaUISETACE^. 



Equisetum Lyellii, Mant. — Engl. 



Phillipsii, DwnA;.— Germany. 



Bm'cliardi, Dunk. — Germany. 



^Gymnospermous Dicotyledons. 



CvCADACEiE. 



Cycadites Brongniarti, Rom. — Germ. 



Morrisianus, Dunk. — Germ. 



Zamites sequalis, Gopp. — Gennany. 

 abietinus (Pteroph., Dunk.). — 



Germany. 

 Dunkerianus(Pteroph.,DMni.). 



— Germany. 

 Lyellianus (Pteroph. ,Z)Mwi-.). — 



Germany. 

 Goppertianus(Pteroph.,DMraA;.). 



— Germany. 



Humboldtianus (Pteroph., 



Dunk.). — Germany. 



Fittonianus (Pteroph., Dunk.). 



— Germany. 



Brongniarti (C3^cad., Mant.). — 



England, Beauvais. 



Pterophyllum Schaumburgense, 

 Dunk. — Germany. 



Zamiostrobus ? crassus, Gopp. — En- 

 gland, Isle of Wight. 



Cycadoidea megalophylla, Buckl. — 

 Portland. 



microphylla, Buckl. — Portland. 



Clathraria Lvellii. Mant. — Sussex. 



Vol. vi. " 14 



