886 FLORAL ZONES OF THE POTTSVILLE FORMATION. 



Alethopteris loxciiitica (Schloth.) Sternl), 



The specimens from the roof of the Sharon coal in Ohio, described 

 by Dr. Newberry under the above name, are probably in closer agree- 

 ment with the original type than any of the other forms that have 

 been identitied under the same name from the Allegheny series of this 

 country. Most of the latter are probably referable to Alethopteris 

 SerJil or A. aquiUna. A form with narrow pinnules, sometimes 

 approaching AhtliopterisdecuTrens^ is found in the coals of the Kanawha 

 series in southern West Virginia. The species is represented by the 

 normal form, or by varieties, in the Upper Lykens division at the 

 Pottsville Gap and at the Lincoln mines. 



Alethoi'Teris grandifolia Newb. 



This species, described by Newberry ^ from the roof of the Sharon 

 coal, is, in general, characteristic of that horizon throughout the Appa- 

 lachian province. Alethopteris Ilelence Lx. and (ydlipteridium Oireni 

 Lx., both occurring" in the Sewanee zone, are so closely related to 

 Newberry's species as to render their specific individuality very 

 doubtful. The group is, in general, characterized by the lax, irregu- 

 lar, and uneven open pinnules, the relatively thin midribs, and the 

 distantly and irregularly ilexuose thin nervation. The flora of the 

 Kemble drift constitutes the oldest plant association in which this 

 species has yet been found. 



Alethopteris discrepans Dn. 



The specimens from the New Lincoln mine, which I refer to Sir 

 "William Dawson's species, appear to agree in all respects with speci- 

 mens from the fern ledges at St. John, New Brunswick. The occur- 

 rence of this species, together with SpJienopteris Ilarttil^ S. pfhsa, and 

 Pecopterk Herrvlata^ in the Upper Lykens division of the Potts\ ille 

 formation points strongly to the close relationship between the flora 

 of the latter and that of the supposed middle Devonian beds at St. 

 John, a relationship so close as to convince me that no appreciable 

 dirtcrciicc ill age exists between the plant beds at the two localities. 



Alktiioi'Teris coxtoniana sp. nov. 



The material which will be described under this name includes the 

 types provisionally referred by Les([uereux" to Calliptcrhl'nnii Dotr- 

 naku. The originals are from Campbell Ledge, in the Northern Anthra- 

 cite field. The specimens from the Southern Anthracite field were 

 found in the thin parting of the conglomerates at 245 feet below the 



> Report Geol. Survey Ohio, 1S7;5, Vol. I, Pt. II, p. :>M, pi. xlviii, figs. 1, la, iind 2. 

 - Goal Flora, Vol. Ill, p. 747. 



