FEENS— PECOPTERIDB.E— rECOPTERIS. 91 



Brougu., wliicli it resembles in its lateral jnuua.' and terminal pinnules, our 

 species differs by its irreg'ular, flexuous, and generally more open pinnaj, 

 the irregular pinnules, and the more compact, outward-arched nervils. 



Besides the differentiating characters of form, texture, and nervation, 

 mentioned at the outset of these remarks, Pecopteris lyseudovestita can further 

 be distinguished from P. clintoni Lx. and P. vestita Lx. by the irregularity 

 of the pinuffi and pinnules, the latter being slightly unequal, and the 

 sporangia, which are longer and more pointed than in P. cUiitoiil, and much 

 broader, more crowded, and larger than P. vestita. The most striking- 

 distinctions for our species, however, are the obtuseness of the lateral pinna;, 

 the smooth rachis, the abseiice of villosity in the sterile pinnae, and the 

 quite different nervation. 



Localities.— Fitcher's coal bank, U. S. Nat. Mus., 5644, 5648, 5725, 

 5775, 5776, 5780, 5781, 5784, 5786, 5788, 5790, 5791, 5794, 5799, 5800, 

 5809; Hobbs's coal bank, U. S. Nat. Mus., 5778, 5789. Owen's coal bank, 

 U. S. Nat. Mus., 5777, 5783, 5793?, 57971, 5798, 5801; Henry County, Mis- 

 souri, Lacoe collection, U. S. Nat. Mus., 3093, 3097, 3174, 3179; Deep- 

 water, U. S. Nat. Mus., 57791. 



Pecopteris vestita Lx. 

 PI. XXXIir, Figs. 1-6; PI. XXVI, Fig. 1. 



1879. Pecopteris vestita Lesquerfux, Coal Flora, Atlas, p. S, pi. xliii, figs. 1-7 (o"?); 



text, vol. i (1880), p. 252 (pars). 

 ISS'.i. Pecopteris vestita Lesquereux, ISth Rept. Geol. Surv. ludiana, pt. 2, pi. xiv, figs. 



1, 1«. 

 18S9. Pecopteris vestita. Lx., Lesley, Diet. Foss. Peunsylvaiiia, vol. ii, p. 612, text fig. 



Frond rather large, spreading, somewhat dense; primary (!) pinnae 

 lanceolate or linear-lanceolate, slightly lax; rachis rather slender, slightly 

 flexed at the bases of the secondary pinnai, sparsely punctate; secondar}^ 

 pinnfe alternate, open, the lower ones at a right angle to the rachis or 

 reflexed, the upper ones somewhat oblique, usually touching or overlapping 

 a little, linear-lanceolate, acute or acuminate, the rachis being rather slender, 

 straight or slightly curved, generally rigid, slightly rounded on the dorsal 

 side, minutely lineate, with rather distant and not very large punctations; 

 ultimate pinnse alternate, very open, the lower ones slightly reflexed, close 

 or touching, the upper ones becoming more distant, but slightly decurrent, 

 oblong, or oblong-triangular when small, becoming lanceolate-triangular and 



