84 M. Brongniart on the Periods of Vegetation. 



Sphenopteris incerta, Brong. 

 Alethopteris Grandini, Brong. ? 

 Callipteris Goeppertii, Brong. 

 Wangenlieimii, Brong. 



EaUISETACE^. 



Calamites gigas, Brong. 



Suckowii, var. major, Brong. 



LvCOPODIACEyE. 



Lepidodenclron elongatum, Brong. 

 , species doubtful. 



NCEGGERATHIE^. 



NcBggeratliia cuneifolia, Brong. 

 expansa, Brong. 



3. Flora of the Slaty Schists 



OF LODfeVE. 

 FiLICES. 



Neuropteris Dufresnoyi, Brong. 

 Sj^henopteris artemisiaefolia, Brong. 



tridactylites, Brong. 



platyrachis, Brong. 



Alethopteris Christolii, Brong. 

 Callipteris hetei'omorplia, Brong. 



Carionii, Brong. 



Pecopteris hemitelioides, Brong. 



oreopteroides, Brong. 



plumosa, Brong. 



abbreviata, Brong. 



dentata, Brong. 



Lodevensis, Brong. 



ASTEROPHYLLITES. 



Annularia floribunda, Sternb. 



CoNIFERiE. 



Walchia Scblotheimii, Brong, 



piniformis, Sternb. 



Stembergi, Brong. 



eutassiforrais, Brong. 



hypnoides, Brong. 



More details respecting the species just enumerated will be 

 found, — for those of the Permian formation, in the work already 

 cited, of MM. Murchison, de Verneuil and Keyserliug (vol. ii. 

 p. 1), on the Geology of Russia ; for those of the slate quarries 

 of Lodeve, in the ' Description Geologique de la France/ by MM. 

 Dufresnoy and JElie de Beaumont (vol. ii. p. 145). It is evident 

 that there are great specific differences between the plants of these 

 localities, and that, up to this time, no species common to all can 

 be recognized. Are these differences to be attributed to the in- 



1. Flora of the Bituminous 

 Schists of Thuringia. 



Alg^. 



Caulerpites selaginoides, Sternb. 



pectinatus, Sternb. 



sphsericus, Sternb. 



Zonarites digitatus, Sternb. 

 Chondrites virgatus, Munst. 



Filices. 



Taeniopteris Eckardii, Germ. 



Sphenopteris dichotoma, Alth. 



Althausii, Brong. (Caulerp. 



patens et dichotoma, Alth.) 



Sphenopteris Goeppertii, Geinitz. 



bipinnata, Geinitz. (Caulerp. 



Munst.) 



Pecopteris crenulata, Brong. (Cau- 

 lerp. crenulatus, Alth.) 



Pecopteris Martinsii, Brong. (Ale- 

 thop. Martinsii, Germ.) 



Pecopteris Schwedesiana, Dunk. — 

 Frankenberg. 



Conifers. 



Cryptomerites Ulmanni, Brora^. (Cu- 

 pressus Ulmanni^ Brown. )-Frank- 

 enberg. 



Walchia (not determinable specifi- 

 cally). 



2. Flora of the Permian Sand- 

 stones OF Russia. 



Filices. 



Odontopteris permiensis, Brong. 



Strogonovii, Morris. 



Fischeri, Brong. 



Neuropteris salicifolia, Fisch. 



tenuifolia, Brong. 



flexuosa, Brong. ? 



macrophylla, Brong. ? 



Sphenopteris erosa, Morris. 

 lobata, Morris. 



