PLATE CXCII. 



ErEMiMTERIS LIN'COLNIAXA I). W. 

 (Page 869.) 



Fig. 1. Fragment imperfectly fallowing the devel<)])inent i>l the pinn?e and pinnules 

 in the lower lateral pinnpe. From the roof of Lyken.* coal N(j. 2 (?) at 

 the New Lincoln mine. 



Fig. la. Enlarged detail from the name specimen, showing the nervation. Twice the 

 natural size. 



Upper Lykens division. 



IMaKU)PTERIS PYGM.EA D. W. 



(Page 876.) 



Figs. 2, ;], 4, r>. and 6. These specimens show the ordinary form and aspect of the 



pinnfe and pinnules of this species. The originals of fig.'^. 



2, 4, 5, and 6 are from the horizon of Lykens coal Xo. 2 



at the Xew Lincoln colliery; the original of fig. 3 is from 



nearly the same horizon, at about 500 feet below the Twin 



coal, in the Pottsville Gap. 



Figs. 4a and (ia. Enlarged details of pinnules of the originals of tigs. 4 and 6, showing 



the sul:)divisiou of the pinnules and the nervation. Twice the 



natural size. 



L'pper Lykens divisio)). 



Al-ETHOPTEKIS EvAXSII Lx. ' 



Figs. 7 and S. Fig. 7 represents the teriuinal ixirtion <>f the compound pinna, while 

 in fig. S fragments of lateral ultimate pimue are seen. Fig. 7 is 

 from the Lincoln colliery; fig. 8 was found in bed H, 550 feet 

 beloAV the Twin coal, in the gap at Pottsville. 



Fig. 7a. Enlarged detail of pinnule shown in fig. 7. Twice the natural size. 



Fig. 8a. Detail of pinnule from the original of fig. 8. showing the nervation an<l the 

 punctation of the lamina. Twice the natural size. 



Upper Lykens dirisiiDi — Si innur zom . 

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