Arber — The Flora of the Ballycastle Coalfield. 175 



and thus one objection to referring the Ballyeastle beds to this horizon is 

 removed. It is to be hoped that before long an opportunity will arise for 

 obtaining further specimens from the Ballyeastle coalfield which will, on the 

 plant'Ovidence alone, remove all doubt as to the horizon. 



Postscript. — Since this paper was written, I have ascertained that there 

 is a specimen in the Manchester Museum from Fairhead, Ballyeastle, which 

 was figured in Professor Seward's Fossil Plants (vol. ii., p. 427, fig. 301, 1911). 

 I have now had an opportunity of seeing this specimen, which is a well- 

 preserved fragment of a frond, either of Rhacopteris incequilatera (Gcepp.), or 

 more probably of R. lindsceformis (Bunb.), for there is still some doubt whether 

 these two plants are not distinct. In this specimen, while the general habit 

 agrees with that of Gceppert's figure (Acad. C. L. 0. Nat. Curios., vol. xxvii., 

 pi. XXX vii, fig. 6, 7a, 7b, 1860), the nerves are markedly stronger and more 

 distant. R. lindsceformis (Bunb.) is not uncommon in Lower Carboniferous 

 rocks of Britain, and the occurrence of such a typical species at Ballyeastle is 

 of interest. 



5. BiBLlOGUAPHY. 



Akber, E. a. N. (1907) : 



A Note on Fossil Plants from the Carboniferous Limestone of 

 Chepstow. Greo. Mag., Dec. 5, vol. iv., p. 4. 1907. 



Berger, J. F., and Conybeare, W. (1816) : 



On the Geological Features of the North-Eastern Counties of 

 Ireland. Trans. Geol. Soc, Ser. 1, vol. iii., p. 121. 1816. 



Bryce, J. (1837) : 



On the Geological Structure of the North-Eastern Part of the 

 County of Antrim. Trans. Geol. Soc, Ser. 2, vol. v., pt. 1, p. 69. 

 1837. 



Geikie, a., Geikie, J., and Jack, E. L. (1872) : 



Ayrshire (North Part), with parts of Renfrewshire and Lanark- 

 shire. Explanation of Sheet 22. Mem. Geol. Surv. Scotland. 1872. 



Griffith, R. (1829) : 



Geological and Mining Survey of the Coal Districts of the Counties 

 of Tyrone and Antrim, in Ireland. Dublin, 1829. Geol. Surv., 

 Dublin. 



