46 CARBONIFEROUS AND PERMIAN FORAMINIFERA. 



Tuedian (Calciferous ) Oi . -, f -n 



> Stigmaria-oTits ot Russia. 

 Sandstone) ? ) 



Upper Devonian. 



According to Ludwig l the Eusulina-beds in the Donetz are on the horizon of the true 

 Coal-measures (passing upwards into the Permian), but in other Russian districts, so far 

 as can be made out, they are confined to the true Carboniferous Limestone, though 

 probably to its upper part. 



I am indebted to the kindness of General G. von Helmersen, of St. Petersburg, for 

 specimens of Fusulina-limestones from several localities in central Russia. Some of these 

 specimens, notably those from the first three localities in the following list, contain other 

 species of Foraminifera as well as Fusulina. To Dr. Herrman Abich, of Tiflis, Georgia, 

 I am under the like obligation in respect to the Fusulina-rocks of the Caucasus, which 

 have also yielded evidence of the existence of some of the minuter types. The remaining 

 localities on the list are given on the authority of Prof. Ehrenberg and M. Edw. 

 d'Eichwald. 



The whole of these may be regarded as pertaining to the Carboniferous Limestone 

 proper. 



132. MiatSChkovO, near Moscow. 



a. A grey, porous, crumbling limestone, with Fusulina cylindrical., 

 Encrinites, and other fossils. 



b. A white, compact limstone, with Fusulina cylindricu and 

 Cheetetes. 



133. OstaschkOVO, on the Volga, in the province of Samara. A light-coloured 



friable limestone, with Fusulina. 



134. Zserew Kurgan, a mountain on the left bank of the Volga, north of the 



town of Samara. A light-brown limestone, almost entirely composed of 

 small and perfect specimens of Fusulina cylindrica. 



135. Witegra, on Lake Onega, Government of Olonetz. White, friable 



Bellerophon-limestone of the Mountain Limestone. See Ehrenberg's 

 ' Mikrogeologie.' 



136. Toilla, Ilornstone of the Mountain Limestone, with Spirifer mosquensis 



(Ehrenberg). 



137. Sloboda, a village in the Government of Toula. Yellow Carboniferous 



clay. See d'Eichwald's " Lethsea Rossica." 



1 Ludwig (Rudolf), ' Die Steinkohlenformation im Lande der Don'sche Kosakeu,' Moscow, 1874. 



