252 Scientific Proceedings, Royal Dublin Society. 



mechanism, somewhat reminiscent of the peristome and epiphragm of Poly- 

 trichum. Tlie paper also deals with the relation of this ovule to Hetemngmm 

 Griemi, and with a new Crossotheoa which is attributed to the same 

 plant." 



It is interesting to find that two seed-hearing members of the Pterido- 

 sperms closely allied to one another, and members of the Lyginodendrese, 

 viz., Crossotheca Hceninghausi Kidst. sp., and Heterangium hibernictim sp. nov., 

 grew in Ireland, H. Jiibernicum in the Upper Devonian and Lower Car- 

 boniferous rooks of Co. Cork, and C. Hceiiinghausi in the Coal Measures or 

 Upper Carboniferous beds of Co. Tipperary. 



Bibliography. 



1. Baily, W. H. : Explanation of Sheets 187, &c., of the County of Cork, 



1864, p. 19, fig. 2« and b. (Mem. Geol. Surv. Ireland.) 



2. Nathorst, a. S. : Zur Oberdevon. Flora der Baren-Insel, Kongl. 



Svenska Vetensk. Akad. Handl. Bd. xxxvi., 1912, p. 11. Taf. 1, 

 Figs. 1, 2. 



3. Brongniart, Adolphe T. : Histoire des Vegetaux fossiles, &c., Tom. i., 



1828, p. 173, PI. liii, figs. 1, 2. 



4. Stur, D. : Die Culm-Flora d. Ostrauer und Waldenburger Schiehten. 



(K. k. Geol. Reichsanst. Bd. viii. Wien, 1875-77, Taf. xiii, fig. 5 ; 

 Taf. xiv., figs. 1-6.) 



5. KiDSTON, E. : On the Fructification and internal structure of Car- 



boniferous Ferns, &c. (Trans. Geol. Soc, Glasgow, vol. is, 1893.) 



6. Scott, D. H. : Studies in Fossil Botany, 1909, Part ii, p. 401. 



7. Williamson, W. C, and D. H. Scott : Further Observations on the 



Organization of the Fossil Plants of the Coal-Measures. Part iii,Lygino- 

 dendron and Heterangium. (Phil. Trans. Roy. Soc, vol. clxxxvi, 1896.) 



8. Potoni]!;, H. : Die Silur und d. Culm-Flora des Harzes, &c. (Abhandl. 



d. K. preuss. Geol. Landest., Heft xxxvi., Berlin, 1901.) 



9. PoTONiii, H. : Lehrbuch der Pflanzen-Palaeontologie, Berlin, 1899. 



10. Scott : supra, (6) p. 418. 



11. Oliver, F. W., and E. I. Salisbury : On the Structure and Affinities of 



the Palaeozoic Seeds of the Conostoma Group. (Annals of Botany, 

 vol. XXV., 1911.) 



12. Benson, Margaret : SjjhcBrostoma ovale, gen. nov., and Crossotheoa 



Grievii, sp. nov., an Account of the Structure and Relations of the 

 Reproductive Organs oi Heterangium Grievii. ("Nature," April 22nd, 

 1909, p. 239.) 



