THE FOSSIL OSMUNDACEiE. 



219 



stems ; but it must be remembered that probably none of these writers have had the 

 opportunity of examining the specimens, and the published descriptions are quite in- 

 adequate to enable one to give a true interpretation of their systematic position. 



As already stated, for the Chelepteris gracilis, Bichwald, we have been compelled to 

 form a new genus, and separate it from those species originally placed in Chelepteris by 

 Corda ; but as the other three genera, Thamnopteris, Anomorrhcea, and Baihypteris, 

 only contain the type specimens, and these are the specimens investigated in this and 

 the succeeding paper, we are fortunately enabled to retain the old names, though the 

 characters on which we now define these genera are entirely derived from their internal 

 organisation. 



Our specimens of Zalesskya, Thamnopteris, Anomorrhcea, and Baihypteris are from 

 the Upper Permian of the Oural, and their geological position is seen in the annexed 

 table, which has been kindly communicated to us by Mons. Zalessky : # — 



D'apres 

 Lapparent. 



Division du 



permien et 



permo-houiller 



en Eussie. 



Le permien d'Oural, gouv. Oufa et 

 Orenbourg. 



CD 



'5b 

 .5 



H 



'53 



CO 



o 



CD 



N 



P 3 



Tattarien 



Marnes bigarres avec les conchiferes. 



P 2 



Calcaires et marnes avec la faune de 

 Zechstein, gypse. 



Les gres cuivreux avec les plantes 

 fossiles {Chelepteris, Sphallopteris, 

 Bathypteris, et Anomorrhma). 



O 



CO 

 CD 



a 



CD 

 SC 

 CD 



o 



Pi 



Marnes bigarres, argiles, gres ou 

 avec la faune marine : Produdus 

 Cancrini, Strophalosia horrescens, 

 ou avec les plantes fossiles 

 ( Catamites gigas). 



a 



CD 



'3 



< 



O 



a 



co 

 co 



'-£ 



t-i 



< 



CO 



S-H 



CD 



O 

 6 



S 



Fh 



CD 



Oh 



P.C. 



Artinskien. Koungourien. 



Calcaires dolomitiques (Produdus 

 Cancrini, Marginifera typica, 

 Dielasma elongata, Fusulina 

 Venieuili). 



Gres d'Artinsk, avec les plantes 

 fossiles et ammonitides. 



* Compiled from Lapparent and other sources. 



