894 FL()RAL ZONES OF THE POTTSVILLE FORMATION. 



trianoular. more unequal, inflated pinnules, with persistent midribs, 

 and more open, strong-ly backward-curved nervation. Neuroptei'ls 

 Sniithsil has been collected at the Brookside and Lincoln mines; at 

 Kalmia. the upper Eureka tunnel, the Broad Mountain mines, and the 

 Lower Lykens division in the Pottsville Gap. 



Neuropteris Elrodi Lx. 



The plants from the Southern Anthracite field identified under this 

 name agree with the original specimens described and figured by 

 Lesquereux^ as having been derived from the Montevallo coal in Ala- 

 bama. The character of the matrix is, however, yer}^ distinct from 

 that of other material in the collection from that locality, it being in 

 \ery close agreement with specimens from the AVhetstone beds of 

 Indiana, in which this species is also said to have been found. 1 sus- 

 pect that the t3^pes originated in the Whetstone beds. The originals 

 represent a species quite different from that in the roof of the Se- 

 wauee coal in Tennessee, later figured"' by Lesquereux under the same 

 name. The latter is, perhaps, inseparable from Neuropteris Schlehani 

 Stur. The differences between this species and Neuropteris Smithsii., 

 the only species in the Pottsville flora with which Neuropteris Elrodi 

 is liable to be confused, have been noted in the remarks on the former. 

 N. K<niithsii^ it will be remembered, is characteristic of the Mariopteris 

 pottsviUea zone in the Lower Lykens division, while Neuropteris Elrodi 

 is almost exclusively confined to the Sewanee zone of the Upper 

 Lykens division, though in its typical form it is not common at so low 

 a horizon as that of the Sewell-Sewanee coal. 



The fern has been found in the horizon of L^^kens coal No. 2, at 

 the Lincoln mines, at the North Brookside slope, and in beds at approxi- 

 mately the same horizon in the Pottsville and Westwood gaps. 



Neuropteris Aldrichi (Lx.). 



This species, which was descriljed })y Lesquereux^ as Callipteridium 

 Aldrichi, from the Black Creek coal at the Jefferson mines in Ala- 

 bama, represents a peculiar form, rather closely related to Neuropteris 

 iSinitli.sii and Ncuroptrrix El rodi, altliough sometimes suggesting Oli- 

 qocarpia or Pecopteris in the form of its pinn.e and pinnules. It 

 coMstitutes one of the singular conqxjsite types in th(^ Pottsville for- 

 mation, and it will l)e descrilied and furtlier illustrated in connection 

 with the monographic treatment of tlie flora of the Pottsville forma- 

 tion in the Appalachian province. 



1 Coal Flora, Vol. I, \>. 107; Atlas, p. 3, pi. .\iii, fig. 4. 



-Il)i(l.. Vol. HI. !>. 73.i, pi. xcvi, (ij;s. 1. 2. 



sibid., Atlu.s, p. 7, pi. x.xxviii, tigs. 1, 1\ l'', 2, 3; text, Vol. I (18S0), p. 171. 



