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. Keupric Epoch 



Amphigeuous Cryptogams. 



Confervites arenaceus, Jag. — Stut- 



gard. 

 Delesserites crispatus, Brong. 



Acrogenous Crjrptogaixis. 

 Ferns. 



Odontopteris Cycadea, Berg. — Co- 

 burg. 



Neuropteris? distans,S^erwJ. — Bam- 

 berg. 



Spliaenopteris Rassertiana, Sternb. — 

 Bamberg. 



peetinata, Sternb. — Bamberg. 



clavata, Sternb. — Bamberg. 



oppositifolia, Sternb. — Bamb. 



Coniopteris Schonleiniana, Br. — 

 Wurtemb. 



Kirchneri, Brong. — Bamberg. 



tricarpa, Brong. — Bamberg. 



Hymenophyllites macrophyllus, Br. 

 — Bamberg. 



Tseniopteris marantacea, Sternb. — 

 Wurtemb. 



elongata, Brong. — St. Leger- 



sur-d'Heunes. 



Peeopteris stutgardiensis, Brong. — 

 Stutgard. 



Meriani, Brong. — Basle. 



taxiformis, Sternb. — Bamberg. 



microphylla, Sternb. — Bamb. 



Cladophlebis flexuosa, Goppert. — 

 Bamberg. 



Rassertii, Sternb. — Bamberg. 



imbricata, Sternb. — Bamberg. 



concinna, Sternb. — Bamberg. 



obtusa, Sternb. — Bamberg. 



Guttbiera angustifolia, Presl. — Bam- 

 berg. 



Phlebopteris Landriotii, Brong. — 

 St. Leger-sur-d'Heunes. 



Camptopteris Munsteriana, Sternb. 



Thaumatopteris ? quercifolia, Brong. 

 — Stutgard. (Peeopteris querci- 

 folia, Sternb.) 



Sagenopteris rhoifolia, Sternb. — 

 Bamberg. 



acuminata, Sternb. — Bamb. 



semicordata, Sternb. — Baden. 



EaUlSETACE^. 



Calamites arenaceus, Brong. — Stutg. 



Jageri, Brong. — Stutgard. 



Equisetites columnaris, Brong. — 



Stutgard, Coburg. 

 cuspidatus, Sternb. — Stutgard, 



Baden. 



elongatus, Sternb. — Stutgard. 



Schonleinii, Sternb. — Wiirz- 



burg. 



conicus, Sternb. — Abschwind. 



sinsheimicus, Sternb. — Baden. 



Equisetum Meriani, Brong. — Basle. 



Munsteri, Sternb. — Bamberg. 



Hoflianus, Sternb. — Waishof. 



mondiformis, Sternb. — Bamb. 



Gymnospermous Dicotyledons. 



Cycadace^. 



Pterophyllum Jageri, Brong. — Stut- 

 gard ; Helibronn. 



longifolium, Brong. — Basle ; 



Austria. 



Meriani, Bron^. — Basle; Stutg. 



Zamites ? Munsteri, Sternb. — Bamb. 



acuminatus, Sternb. — Bamb. 



heterophyllus? Sternb. — Bamb. 



Conifers. 



Taxodites Munsterianus, Sternb. — 

 Bamberg. 



tenuifolius, Sternb. — Bamb. 



Cunninghamites ? dubius, Sternb, — 



(Pini- 



Peuce Keuperianus, linger. 

 tes.) — Bamberg. 



Doubtful Monocotyledons. 



Palaeoxyris Munsteri, Sternb. — Bam- 

 berg. 

 Preisleria antiqua, Sternb. — Bamb. 



