PLATE CXCI. 



NErijoiTEKis PocAnoNTAs var. ix^qialis D. W^ 



( Page 890. ) 



FigH. 1-4. Fip?. 1 and 2 nhow the characteristic development of the pinnules in the 

 small pinna\ Fig. 2a shows a pinnule from the original of fig. 2, 

 enlarged to twice the natural size, to illustrate the nervation. Fig. 3 

 includes pinnules with the elongated form, constricted at the base, 

 immediately above the pinnatifid pinnules. The specimen shown in 

 fig. 4 is drawn twice the natural size, to show the characteristic out- 

 line of the base of the pinnule and the nervation. The original of 

 fig. 1 is from the drift on the east side of Rausch Gap; that of fig. 2 is 

 from the Kalmia colliery; that of fig. 3 was obtained from the roof of 

 Lykens coal No. 4 at the Lincoln mine; the original of fig. 4 comes 

 from bed D, 710 feet below the Twin coal, in the gap at I'ottsville. 



Loinr Li/kciif: (llrixioii. 



NElItOPTKRIS PoCAUOXTAS D. W. 



(Page 888.) 



Fig. 5. This specimen shows the smaller upper lateral pinnje, suggestive in form and 

 size of the Xeuropteris SniUlisil Lx. The lateral pinnules are, however, 

 clearly seen to be broadly attached to the rachis, the nervation being 

 Odontopteroid, the midrib scarcely developed. From the roof of the 

 Pocahontas coal at Gilliam, West Virginia, Pocahontas quadrangle. 



Fig. 5a. Enlarged detail of pinna in the original of fig. 5, showing the form of the 

 piniuiU's and the nervation. Twice the natural size. 



A'/i' (if till' Lnin I- [jikois (Uvixinn. 



SrillCNOI'lIVLLl'M TEXl'E I >. W. 



(Page 901.) 



Figs. 6 and 7. The figures show the slender, narrowed liases f)f the pinnules and the 

 round-truncate, crenulate, distal margins. A fragment of one of 

 the deeply dissected leaves from a verticel at the point of ramifi- 

 cation is shown in fig. (5. The original of fig. 6 is from the Clark 

 formation at Smith's Store, Virginia, Pocahontas (juadrangle; that 

 of fig. 7 is from the Pottsville at Warrior, Alabama (No. 8501 of 

 the Lacoe collection. United States National Museum). 



Loifir Lifkcns dlvimon — M(irU)]}li'rix pnttfo'lllea zone. 



TUKioNCUAKl'l-.M A.MP11J..EFORME Lx. Var. SIMXTABILE D. W. 



(Page 909.) 



Fig. S. This specimen shows well the thin, rather broad wings, the elongated micro- 

 pylar neck, and the faint subordinate t"st;r. The spt'cimeii is from the 

 Linciiln collit'ry. 



I'jijtf'r Lifkcnx ilivtsioii. 

 926 



