have successively occupied the surface of the Earth. 195 



do not prevent each from having its peculiar characters, and fre- 

 quently a totality of species almost all peculiar to each particular 

 epoch. We must therefore distinguish here these different subdi- 

 visions, the number of which will perhaps be multiplied here- 

 after, when the plants of each of the stages of the Jurassic for- 

 mation are better known. 



1. Keupr 



Amphigenous Cryptogams. 



Alg^. 



Confervites arenaceus, Jag. — Stut- 



gard. 

 Delesserites ciispatus, Bronr/. 



Acrogenous Cryptogams. 

 Ferns. 



-Co- 



Odontopteris Cycadea, Berg.- 

 burg. 



Neuropteris? (\ista.ns,Sternb. — Bam- 

 berg. 



Spliajnopteris Rassertiana, Sternb. — 

 Bamberg. 



pectinata, Sternb. — Bamberg. 



clavata, Sternb. — Bamberg. 



oppositifolia, Sternb. — Bamb. 



Coniopteris Schonleinlana, Br. — 

 Wurtemb. 



Kirchneri, Brong. — Bamberg. 



tricarpa, Brong. — Bamberg. 



Hymenophyllites macrophyllus, Br. 

 — Bamberg. 



TfEiiiopteris marantacea, Sternb. — 

 AVurtemb. 



elongata, Brong. — St. Leger- 



sur-d'Ileimes. 



Pecopteris stutgardieusis, Brong. — 

 Stutgard. 



Meriani, Brong. — Basle. 



taxiformis, Sternb. — Bamberg. 



microphylla, Sternb. — Bamb. 



Cladophlebis flexuosa, Goppert. — 

 Bamberg. 



Rassertii, Sternb. — Bamberg. 



imbricata, Sternb. — Bamberg. 



concimia, Sternb. — Bamberg. 



obtusa, Sternb. — Bamberg. 



Guttbiera angustifolia, Presl. — Bam- 

 berg. 



Plilebopteris Laudriotii, Brong. — 

 St. Leger-sm--d'Heunes. 



Camptopteris Mmisteriana, Sternb. 



Thaumatojiteris } quercifolia, Brong. 

 — Stutgard. (Pecopteris querci- 

 folia, Sternb.) 



ic Epoch. 



Sagenopteris rhoifolia, Sternb. — 

 Bamberg. 



acuminata, Sternb. — Bamb. 



semicordata, Sternb. — Baden. 



EaUISETACE.E. 



Calamites arenaceus, Brong. — Stutg. 



Jageri, Brong. — Stutgard. 



Equisetites columuai-is, Brong. — 



Stutgard, Cobm-g. 

 cuspidatus, Sternb. — Stutgard, 



Baden. 



elongatus, Sternb. — Stutgard. 



Schonleinii, Sternb. — Wiii'Z- 



burg. 



conicus, Sternb. — Abschwind. 



sinslieimicus, Sternb. — Baden. 



Equisetum Meriani, Brong. — Basle. 



Munsteri, Sternb. — Bamberg. 



Hoflianus, Sternb. — Waishof. 



mondiformis, Sternb. — Bamb. 



Gymnospermous Dicotyledons. 



Cycadace^. 



-Stut- 



Pterophyllum Jageri, Brong. 



gard ; Helibroun. 

 lougifolium, Brong. — Basle ; 



Austria. 



Meriani, Brow^r. — Basle; Stutg. 



Zamites ? Munsteri, Sternb. — Bamb. 



acuminatus, Sternb. — Bamb. 



heterophyllus? Sternb. — Bamb. 



Conifers. 



Taxodites Munsterianus, Sternb. — 



Bamberg. 



tenuitblius, Sternb. — Bamb. 



Cunninghamites ? dubius, Sternb. — 



Bamberg. 

 Pence Keuperianus, linger. (Pini- 



tes.) — Bamberg. 



Dovibtful Monocotyledons. 



Palaeoxyris Munsteri, Sternb. — Bam- 

 berg. 

 Preisleria antiqua, Sternb. — Bamb. 



