12 



Frond imparl -pinnate; petiole moderately prominent 

 and attenuate; leaflets nearly elliptical, decurrent and 

 confluent; midrib indistinct; veins furcated, — some 

 emanating from the midrib and others from the petiole. 



Our specimen perfectly coincides with King's figure, 

 and the points of disparity between the former and the 

 representations of Krongniart, and of Lindley and Hutton 

 also precisely correspond Avith those noticed by King ' . 



Distribution, — in coal formation, at Felling Colliery, 

 England; in Pennsylvania. 



(?) ALETHOPTERIS MARGINATA, GO PP. 



G(ipp. Si/st. Jil. foas. p. 301. 

 linger, Gen. et Spec. p. 147. 



FErOPTHUIS ^lARGlNATA, 



BroHfj. Prodr. p. 57; Hist, regct. foss. I, p. 291, pi. 87, Jig. 2. 



Frond pinnately parted, — the sinuses reaching 

 nearly to the petiole, which is curvilinear and gradually 

 attenuate; pinnulae dilate, confluent and decurrent at 

 the base, — crenate and ])ossessing a heavily marked 

 margin, — approximativcly lanceolate, and rounded at 

 the apex; surface of the pinnulae strongly undulating; 

 midrib very prominent; nerves distinctly dichotomous 

 and arranged nearly at right angles to the midrib. 



I "In figure 9, plate 5, 1 have represented a portion of the 

 Felling Fecopteris nervosa , by which it will be seen that although 

 the leaflets are confluent with each other at the rachis, and, there- 

 fore, so far in agreement with the genus in which it has been 

 placed , — the absence of a distinct midrib (Iti Lindley and Hut- 

 ton's figure of this species, the leaflets are represented with wliat 

 might be considered a midrib ; but the veining has not been 

 properly attended to.) and several veins springing from the rachis, 

 utterly forbid us placing it in Pecopteris^^ — etc. King, ibid. 



