898 FLOKAL ZONES OF THE POTTSVILLE FORMATION. 



ANXUT.ARIA ACICUT.AKIS (Du.) Reil. 



This species, which is, perhaps, most closel}' related to Anmdaria 

 Todtata Brongn., and which was described b}' Dawson from the fern 

 ledges (Lancaster formation) at St. John, New Brunswick, as A^'tcro- 

 j>lnjl.Jttes acicidar'ts^ is not rare in the Sewanee zone of the Pottsville 

 formation, its most frequent occurrence being in the upper part of that 

 zone. Its salient features arc the slender axis and the very slender 

 leaves, which are distinctly narrowed, in tapering form, both toward 

 the base and toward the apex. It has been very well illustrated in the 

 publications of Sir AYilliam Dawson.^ The ]:)lant occurs in the Sewanee 

 zone at the Lincobi mine and in the Pottsville (iap. 



AXXULAKIA CUSPID ATA Lx. 



The typical form of this species, as illustrated bv Lesquereux," from 

 the dark shales at Kushville, Ohio, has a rather wide geographic dis- 

 tribution throughout the Appalachian region, in the uppermost part 

 of the Sewanee zone, or in the zone of Lykens coal No. 1, it being one 

 of the characteristic forms of that portion of the sections. In the 

 Southern Anthracite field it occurs in the roof of Lykens coal No. 1 

 at the Lincoln mine, and in the plant beds 380 feet below the Twin coal 

 in tli(> Pottsville Gap. 



AXNULARIA LATIFOLIA (Dn.) Kidst. 



A comparison of the material in hand with. specimens frcmi the 

 middle Devonian at St. John '' unquestionably shows the specific iden- 

 tity of the American material with that from New Brunswick. It is, 

 perhaps, specifically indistinguishable from the leaf verticils from 

 Campbell Ledge described l)y Lesquereux* as Calamites raniifer 

 Stur. In the Pottsville formation this species, which appears to stand 

 in an ancestral relation to Ammla7'ia .sfeUafa, occurs near the horizon 

 of the Lvkens coal No. 1 — i. e., near the base of the Fayette formation 

 in the Virginia region and in bed L, 380 feet below the Twin coal, in 

 the Pottsville Gap. 



Sphenophyllum tenekrimim Ett. \ iir. euoxgatim n. \ar. 



PI. CXCIII, Figs. 8, 1». 



This variety ditlers from the species as described by Ettingshausen '^ 

 chiefl}' b}' the considerably larger size of the verticils and the more 



> Quart. Jour. Gcol. Soc. Lond., Vol. XVIII, 1862, p. 310, pi. xiii, fig. 16a 16b; Acadian Geol., 1868, p. 

 5.55, fig. 194 H' ; Fossil Plants of the Devonian and Upper Silurian Formations of Canada, 1871, p. 28, 

 PI. V, figs. .5-la-c, 57. ' 



-Coal Flora, Vol. Ill, p. 72.5, pi. xeii, fig. 7, 7a. 



*Da\vson, Quart. Jour. Ccol. Soc. Loud., Vol. XVIII, p. 311. pi. xiii, fig. 17a-c: Acadian Cii'ol., ISCiS, 

 p. 53S, fig. 1S7 A and I)'; Geol. Hist. Plants, IKSS, pp. 78, 26.5, fig. 28a, D., D'. 



■•Coal Flora, Vol. Ill, p. 703, pi. xci, figs. 4 and 4a. 



& Ilclmhackcr, Beitr. Kcnntn. Siidrandes Oberschl. Pol. Pteinkohlenf.. p. 2S, pi. iii. figs. 5-16; Stur 

 Culm.-Flora, Pt.II, p. lOH, i.l.vii, text figs.21a-e, p. 110; 22,p.in- 2:i A-F, p.lH: LM,i).n.5. 



