84 



M. Brongniart on the Periods of Vegetation. 



Sphenopteris incerta, Brong. 

 Alethopteris Grandini, Brong. ? 

 Callipteris Gceppertii, JBrora^r. 

 Wangenheimii, Brong. 



EaUISETACE^. 



Calamites gigas, Brong. 



Suckowii, var. major, Brong. 



Lycopodiace^. 



Lepidodendron elongatum, Brong. 

 , species doubtful. 



NCEGGERATHIE^. 



Noeggerathia cuneifolia, Brong. 

 expansa, Brong. 



3. Flora of the Slaty Schists 

 OF LoDfevE. 



Filices. 



Neuropteris Dufresnoyi, Brong. 

 Sphenopteris artemisiaefolia, Brong. 



tridactylites, Brong. 



platyrachis, Brong. 



Alethopteris Christolii, Brong. 

 Callipteris heteromorpha, Brong. 



Carionii, Brong. 



Pecopteris hemitelioides, Brong. 



' oreopteroides, Brong. 



plumosa, Brong. 



abbreviata, Brong. 



dentata, Brong. 



Lodevensis, Brong. 



ASTEROPHYLLITES. 



Annularia floribunda, Stemb. 



CoNIFERvE. 



Walchia Schlotheimii, Brong. 



piniformis, Stemb. 



Stembergi, Brong. 



eutassiformis, 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 Keyserling (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 Elie de Beaumont (vol. ii. p. 145). It is evident 

 that there are great specific diiferences 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. 



AlgjE. 



Caulerpites selaginoides, Stemb. 



pectinatus, Sternb. 



sphaericus, Sternb. 



Zonarites digitatus, Sternb. 

 Chondrites virgatus, Munst. 



Filices. 



Tseniopteris Eckardii, Germ. 



Sphenopteris dichotoraa, Alth. 



Althausii, Brong. (Caulerp. 



patens et dichotoma, Alth.) 



Sphenopteris Gceppertii, Geinitz. 



bipinnata, Geinitz. (Caulerp. 



Munst.) 



Pecopteris crenulata, Brong. (Cau- 

 lerp. crenulatus, Alth.) 



Pecopteris Martinsii, Brong. (Ale- 

 thop. Martinsii, Germ.) 



Pecopteris Schwedesiana, Dunk. — 

 Frankenberg. 



CoNIFSRiE. 



Cryptomerites Ulmanni, Br ow^r. (Cu- 

 pressus Ulmannij 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. 



