880 FLORAL ZONES OF THP: POTTSVILLE FORMATION. 



punc-tat(^ rac'his. l»y the hroader-lohod, shorter pinnules, the texture of 

 which is more delicate or membranous, and by the relatively simple 

 nervation, the nerves forking- more distantly at a narrower angle and 

 curving- upward so as often to become nearl}' parallel in the lobe. 

 The species is quite distinct from the Spiicnopterk fmg'dls Sternb., 

 which is cited b}' Brongniart' as a synonym of Splieixopteris Graven- 

 litn-sfH. This plant, which occurs at TlO feet below the Twin coal in 

 the gap at Pottsville, appears to be characteristic of, though of rare 

 occurrence in, the Mtrriopterin pottsmllea zone in the Southern Appa- 

 luchiaii region. 



SrilKNOl'TKUlS I)1\'AKI('ATA ((jOCpp.) (xcin. & Gutl). 



This species probably bears the closest relation to Sph<nr)pt,ri.s 

 asjjlenloldt'x^ and appears, as represented by specimens in the Scwanee 

 zone (Upper Lykens division), to be disting-uished from the latter 

 chiefly b}' the short, thick, obtuse, cuneate, often half-flabellate lobes 

 of its more distant i)innules. Even in small fragments it is much 

 coarser than the Larischiform Splienopterh asplenioides. 



Si'IIENOPTERIS MICROCARPA Lx. 



This fern, which in its typical form appears to be more or less 

 characteristic of the Clark and Quinnimont formations in the Southern 

 States, is represented in the Upper Lykens division, in the Southern 

 Anthracite field, by a very delicate, deeply cut variety, which I have 

 termed dmecta. This varietv, which occurs at the New Lincoln mine, 

 is also rarely found in the Sewell formation, in the Virg-inia region. 



SPHENOPTERIS HaRTTII Dh. 



The specimens from the New Lincoln mine and from the Pottsville 

 (iap, which I refer to Sphoiopteris ILuitll. appear to agree in all 

 respects with examples of that species from the supposed middle 

 Devonian beds at th(> type locality. St. John. New Brunswick. 



SlMIENOl'TERIS I'ATENTISSIIMA (Ett. ) Scllini}). 



PI. CLXXXVTIl. Fig. 1. 



Primary pinna* pi-obal)ly arranged ]/nuiateiy along an axis; prin- 

 cipal divisions bipinnate or tripiiuiatitid. ovate-triangular or trian- 

 gular-acute, inetiuilateral. lax, with relatively slender, more or less 

 llexuose. naiTowly alate rachial axis, wdiich is lineate, narrowly suieate 

 Ncntraily, sutx-arinate dorsally; ultimate pinna* alternate, distant, 

 open, often at a right angle, llexuose. linear or linear-lanceolate. a(-ute, 

 ()!• somewhiit obtuse. 



Pinmdes alterntite. usually distant, \cry ()[)eii. often nearly at a 



I Hist. vc'g. foss., p. 191. 



