414 Mr. H. B. Brady on a 



XL. — Notes on a Grouip of Russian FusuliriEe. 

 By Henry B. Brady, F.R.S. 



[Plate XVIII.] 



Certain minute fossils of the Carboniferons Limestone of 

 Miatsclikovo, Toula, and elsewhere in Russia, variously treated 

 by a succession of observers, seem scarcely yet to have found 

 a settled or recognized position. Amongst a number of rock- 

 specimens of Carboniferous age kindly sent to me some time 

 ago by General G. von Helmersen of St. Petersburg, was a 

 piece of the white limestone of Miatschkovo 5 and the following 

 lirief notice of its constituent organisms is intended to set at rest, 

 as far as may be, some of the doubtful or debated points of the 

 structure and affinities of the group to which they pertain. 



The fossils referred to have been more or less described by 

 Fischer, Rouillier and Vosinsky, Ehrenberg, D'Eichwald, 

 and Abich, under the generic names Fusulina^ Nummulina^ 

 Borelis, Alveoh'na, and Orobias, as follows : — 



Fusulina cylindrica, Fischer von Waldheira, 1829, Bull. Soc. Imp. des 



Naturalistes de Moscou for 1829, p. 329 ; Oryctographie de Moscou, 



p. 12G, pi. 13. figs. 1-5. 



dejn-essa, id. ibid. p. 127, pi. 13. figs. 0-11. 



Niimmtdina antiqvior, Rouillier aud Vosinsky, 1849, Bull. Soc. Imp. des 



Naturalistes de Moscou, vol. xxii. p. 337, pi. K. figs. 66-70, &c. 

 Burelis princeps, Ehrenberg, 1854, Mikrogeologie, pi. 37. § x. C. figs. 1-4. 



spliceroidea, ibid. IX fig. 1. 



constricta, ibid. figs. 5, 6. 



lahyrinthifvrmis, ibid. pi. 37. § xi. fig. 3. 



palaoluphus, ibid. figs. 4, 5. 



palcpophacus. ibid. fig. 6. 



jndeeoqdiccra , ibid. tigs. 7, 8, 



Alveolina mo7it!pant, ibid. pi. 37. § x. 0. fig. 5. 



prisca, ibid. § x. D. fig. 7, § xi. fig. 1. 



Fusulina sphcerica, Abich, 1858, Mem. de I'Acad. Imp. des Sci. de St. 



Petersbourg, ser. 6, vol. vii. 1859; Mem. phys.-math. p. 528, pi. 3. 



fig. 13, a, b, c. 

 Orobias antiquior, D'Eichwald, 18C0, Lethsea Rossica, vol. i. p. 353. Esp. 26. 

 cequalis, ibid. p. 353, pi. 22. fig. 16, a-c. 



Some of these forms had been mentioned by Ehrenberg in 

 the ^Monatsberichte' of the Berlin Academy for 1843, i. e. pre- 

 vious to the publication of the ' Mikrogeologie;' but the figures 

 of the latter work are more eligible for reference than the 

 mere names or verbal descriptions which alone are given with 

 the preliminary notice. 



Most of the organisms in this list have been treated, in times 

 past, both by Messrs. Parker and Rupert Jones and myself, as 

 varieties of the genus Fusulina ; but I hope to be able to 

 demonstrate that they are all members of a series in which it 

 may not eventually be difficult to trace every gradational link 



