414 Mr. H. B. Brady on a 



XL. — Notes on a Group ofBiissi'ayi Fusulinae. 

 By Henhy B. Brady, F.H.S. 



[Plate XVIII.] 



Certain minute fossils of tlie Carboniferous Limestone of 

 ^liatschkovo, Toula, and elsewhere in Kussia, variously treated 

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

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

 sj)ecimens 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 ; and the following 

 brief 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, Eouillicr and Vosinsky, Ehrenberg, D'Eichwald, 

 and Abich, under the generic names Fusulina, Nummulina, 

 Borelis, Alveolijia, and Orobias, as follows : — 



Di-^ttlina cyUndrica, Fischer von Waldheira, 1829, BuU. Soc. Imp. des 



Xaturalistes de Moscou for 1829, p. 329 ; Oryctograpliie de Moscou, 



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



(lepressd, id. ibid. p. 127, pi. 13. figs. G-11. 



Kiimmiilina (nitiquior, Rouillier and Vosinsky, 1849, Bull. Soc. Imp. des 



Xaturalistes de Moscou, vol. xxii. p. 337, pi. K. figs. UG-70, &e. 

 Borelis priiiceps, Ehrenberg, 1854, Mikrogeologie, pi. 37. § x. C. figs. 1-4. 



xphceroidea, ibid. U. fig. 1. 



constrida, ibid. figs. 5, 6. 



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



palaolopJius, ibid. figs. 4, 5. 



palc(02yhitcus, ibid. fig. 0. 



jmlaoajihccra, ibid. figs. 7, 8. 



AlveoHna viontiparu, ibid. pi. 37. § x. C. fig. 5. 



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



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



Petersbom-g, scr. 6, vol. vii. 1859 ; M^m. phys.-math. p. 528, pi. 3. 



tig. 13, a, b, c. 

 Orobicis antiqidor, D'Eichwald, 18( 0, Lethaea Rossica, vol. i. p. 353. Esp. 20. 

 aqualis, 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 ti'eated, in times 

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

 varieties of the genus FusuUna ; 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 



