G8 BRITISH EOCENE FLORA. 



The discovery, subsequent to the publication of our description, of fertile fronds of 

 Lygodium with very short and completely separated pinnules, closely resembling in 

 their appearance and disposition the specimen described with some doubt as A.^pJenites 

 pra-allosuroides, has convinced me that this supposed species is only an example of the 

 fertile frond of Lygodium, with exceptionally abbreviated pinnules. The thick car- 

 bonized substance and consequent indistinctness of this and of the original Asplenites 

 aUosiiroidcs from Sotzka, is entirely in favour of this view, and both species must, 

 I think, be referred to this species. 



15. Marattfa Hookeri, Ett. 8f Gard. (Page 54.) 



Marailla IlooJceri has only been detected at Alum Bay, where it is by no means 

 rare (PI. XII, figs, 1 — 6). It appears to be closely alhed to M. Kaulfussii, of the West 

 Indies, Columbia, and the Brazils ; more particularly resembling it when the fronds are 

 not fully developed. M. Kaulfussii is the only species belonging to the group Eupodium, 

 separated on account of its shortly stalked synangia without an involucre. No fossil 

 Marattia was known previously, and no other Fern is known from Alum Bay, unless it be 

 Anemia subcreiacca, which Heer states to have been found there.^ 



16. Onoclea HEBRAiDiCA {Forbcs). Plate XIII, figs. 5 and 6. 



FiLiciTES HEBiiAiDicx]s,i^o/-6e5. Quarterly Journal Geological Society, vol. vii, p. 103, 



pi. ii, fig. 2, 1851. 

 Onoclea SENSiBiLis, L., Newbemj . Ann. Lye. Nat. Hist., N. Y., vol. ix, April, 1S68. 

 WooDWARDiTEs ARCTicus, Heer. Flora fossilis arctica, vol. i, p. 86, 1868. 



0. fronde pinnata, pinnis ohlongis vel linearibus, pinnatifdis, lobis rotundatis, denticu- 

 lalis vel integerrimis ; nervatione Dictyopteridis compositde exappendiculata, nervo 

 jmmario subrecto prominente, nervis secundariis tenuibus Jlexuosis, angulo acuto egredien- 

 iibus ; nervis tertiariis brevissimis diciyodromis, maculis Dictyopteridis 2 — 3 seriatis, 

 inaqualibus. 



From the Ardtun Beds, Mull. 



The material upon which the descri])tion of this Fern is based consists of the apex of 



1 This and C. Lamceanum are given in Baron Ettingshausen's list of the Alum Bay flora, I tliink in 

 error, as neither Keeping nor myself have, after years of collecting, ever come across them, and no 

 specimen of either Fern from that locality is now preserved in the national collections. 



