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 Cycadeae, the frequency of the Otozamites and Zamites, 

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

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

 phyllum 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. 



Amphlgenous Cryptogams. 



Alg^. 



Confervites fissus, Dunk. — Germany. 



Acrogenows 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. 



Haitlebeni, Dunk. — Germany. 



longifolia. Dunk. — Gennany. 



Adiantites Mantelli, Brong. — Germ. 

 (Cyclopteris Mantelli, Dunk.) 



? Klipsteinii, Brong. — Germ. 



(Cyclopt. Klipsteinii, Dunk.) 



Cladophlebis Albertsii,BroM^. — Ger- 

 many. (Neuropteris Albertsii, 

 Dunk.) 



Pecopteris Huttoni, Brong. — Germ. 

 (Neuropt. Huttoni, Dunk.) 



Geinitzii, Dunk. — Germany. 



Murchisoni, Dunk. — Germany. 



Conybeari, Dunk. — Germany. 



elegans, Brong. — Germany. 



(Alethopt. elegans, Dunk.) 



polydactyla,£)MnAr. — Germany. 



Ungeri, Dunk. — Germany. 



gracilis. Dunk. — Germany. 



Cordai, Dunk. — Germany. 



Althausii, Dunk. — Germany. 



Browniana, Dunk. — Germany. 



? linearis, Sternb. — Germany 



(non P. Reichiana, Brong.). 



Lonchopteris Mantelli, Brong. — En- 

 gland, Beauvais. 



? Huttoni, Presl. — Germanv. 



Ann. ^ Mag. N. Hist. Ser. 2. 



Hausmannia dichotoma, Dunk. — 



Germany, 

 Protopteris? erosa, Ung. — England. 



(Endogenites erosa, Mant.) 



Marsileace^. 



Baiera Huttoni, Brong. — Germany. 



(Cyclopteris digitata, L. 4* H., non 



Brong.) 



Brauniana, Dunk. — Germany. 



nervosa, Dunk. — Gennany. 



EqUISETACEjE. 



Equisetum Lyellii, Mant. — Engl. 



Phillipsii, Dunk. — Germany. 



Burchardi, Dunk. — Germany. 



, [Gymnospermons Dicotyledons. 



Cycadace^. 

 Cycadites Brongniarti, Rom. — Germ. 



Morrisianus, Dunk. — Germ. 



Zamites sequalis, Gopp. — Germany. 

 abietinus (Pteroph., Dunk.). — 



Germany. 

 Dunkerianus (PteroTph.,Dunk.), 



— Germany. 

 Lyellianus(Pteroph., Dunk.). — 



Germany. 

 Goppertianus(Pteroph.,DunA;.). 



— Germany. 



Humboldtianus (Pteroph., 



Dunk.). — Germany. 



Fittonianus (Pteroph., Dunk.). 



— Germany. 



Brongniarti (Cycad., Mant.). — 



England, Beauvais. 



Pterophyllum Schaumburgense, 

 Dunk. — Germany. 



Zamiostrobus ? crassus, Gopp. — En- 

 gland, Isle of Wight. 



Cycadoidea megalophylla, Buckl. — 

 Portland. 



microphylla, JB«cA;Z. — Portland. 



Clathraria Lvellii, Mant. — Sussex. 



Vol vi. ' 14 



