white.] notes on characteristic species. 895 



Neuropteris tennesseeana Lx. MSS. 



The fragments representing this species, from a bed about 550 feet 

 below the Twin coal in the gap at Fottsville, appear to agree in all 

 respects with the types described in manuscript by Professor Lesque- 

 reux as Neuropteris tennesseeana. This species, which seems to have 

 been derived from the original Neuropteris PocaJiontas stock, and 

 which has many features in common with Neuropteris heterojyhylla., 

 appears to be characteristic of the lower portion of the Sewanee zone, 

 in both the Walden formation in Tennessee and the Upper Lykens 

 division in the Southern Anthracite field. 



Neuropteris ovata Hoffm. 



The normal form of this species, which elsewhere is not known at 

 so low a horizon as the uppermost beds of the Pottsville formation, 

 appears to be present in the Southern Anthracite field in one of the shale 

 partings in the topmost group of conglomerates, at 245 feet below the 

 Twin coal. The variety antiqua^ which is characterized by slender, 

 apiculate pinnules, very broadly attached to the rachis, and b}^ the 

 unusually oblique nervation, is present in material from the rock 

 dumps at the Lincoln collieries, although I am not certain to which of 

 the Upper Lj^kens coals the fragments should be referred. 



Neuropteris gigantea Sternb. 



Under this name I provisionally refer the material described bj" 

 Professor Lesquereux ^ as Neuro_pteris suhfaJcata. The original form, 

 as described and figured by Sternberg, if present in our Carbonifer- 

 ous basins, appears, so far as yet known, to occur only in the topmost 

 beds of the Pottsville formation. Most of these specimens from the 

 roof shales of Lykens coal No. 2, or from the higher horizons of the 

 Sewanee zone, are generally more elongated than the Old World type. 

 The examples from the Kemble drift appear to represent a new 

 variety, clavata^ the most salient or distinctive features of which are 

 the generally greatl v elongated, though somewhat polymorphous, pin- 

 nules, which are frequently broader in the upper third than in an}' 

 other portion of their length; the extremely slender and poorl}^ 

 defined median nerve; and the veiy oblique, close, hair-like, parallel 

 nervation, a portion of which springs directly from the rachis. 



Neuropteris lunata sp. nov. 



PI. CXCIII, Figs. 3-T. 



Frond and mode of development of the pinnse probably similar to 

 those of Neuropteris gigantea., the rachis attaining a width of 12 mm. or 

 more, very distantly but coarsely punctate, the penultimate rachis being 



'Coal Flora, Atlas, p. :?, p). xiii, figs. 5, 6; text, Vol. I (1880), p. 102. 



