BY THE REV. J. E. TENISON-WOODS, F.G.S., F.L.S. 97 



width, 6 lines. Veins slightly radiating, slender (about 14 in. 

 3 lines across the middle), with two or three dichotomous branches 

 from base to upper margin, edges only slightly lacerated. 



Obs. — This species is most allied to the Canadian A. jacksoni, 

 from the upper Devonian beds of Gaspe, from which it differs in 

 its larger and broader pinnules, and to the A. hibemica, from the 

 upper Devonian of Kilkenny and Berwickshire, from which its 

 shorter, broader and more closely set imbricated pinnules and 

 smaller pinna? distinguish it. The fertile pinnules have not been 

 found as yet. Abundant in the upper Devonian olive flags of 

 Iguana Creek. 



A. wilkinsoni, Feist. Paleoz. u. Mes. Flora d. Ost. Australiens, 

 p. 148. Pinnate, rachis narrow, somewhat striate, sometimes 

 forked ; segments of the pinnules sub-alternate, oblong ovate, 

 pinnatifid segments or slits sub -alternate, cuneiform, narrowed at 

 the base, decurrent, incised, lobes denticulate, the terminal ones 

 bi-tri-lobed with incised dentations. Veins very close flabellately 

 dichotomous. 



Obs. — This form approaches nearest to A. lyra, Stur. and A. 

 dissecta, Goep., but in the latter the pinnae are longer, the segments 

 or slits are wider apart, are longer and more slender. Locality, 

 Smith's Creek, near Stroud, horizon probably lower Carboniferous. 



Another species of Arckceopteris is spoken of by Feistmantel 

 (loc. cit. p. 148) and figured (Tab. IV, XXII, fig 4), but the 

 specimen is too imperfect to be determined. From the same 

 locality. 



Rhacopteris, Schimper. 



Frond pinnate, rachis rigid, grooved in the middle. Pinnae 

 elongate broadly linear. Pinnules sub-horizontal, somewhat remote, 

 contiguous or sub-imbricate, spreading, oblong rhomboidal, more 

 or less deeply incised and flabellate, lobes narrow, straight, or 

 slightly removed. Obs. — The incisions are in the direction of the 

 veins, and each ligule comprises one or two branches. The naL a 

 refers to the incision of the pinnules. The genus is confined to 

 the Devonian or Lower Carboniferous. 



G 



