76 PP. REPORT OF PROGRESS. FONTAINE & WHITE. 



Pecopteris pachypteroides. Sj). nov., PL XXVI, Figs. 1-4. 



(Frond, tripinnate ; primary racliis, rather stout ; second- 

 nry pinnae, alternate, somewhat remote, having a narrowly 

 winged, somewhat flexuous rachis ; tertiary pinnae (pin- 

 nules) numerous, alternate, very obliquely inserted on the 

 rachis, and cut into 6-10 pairs of lobes ; mid-rib broad and 

 leather-like ; lobes of the pinnules dense and coriaceous, 

 with an indistinct mid-nerve, from which lateral nerves pass 

 in a x^innate manner, but are obscurely shown, apparently 

 simple.) 



The texture of the pinnules is so dense, and the nerves 

 are so deeply hurried in the leaf substance, that the details 

 of the nervation cannot be made out clearly. The lobes of 

 the pinnules have a peculiar falcate or hooked form in the 

 middle and upper part of the frond. In the lower portion 

 they become crenate, as is shown in Fig. \a. 



Figs. Ic and lb are enlarged pinnules from the middle 

 and upper part of the frond, and show the form of the lobes 

 there. Fig. 4 rej)resents a detached terminal portion of a 

 comjjound pinna. 



Some of the forms of this 2:»lant have a strong resemblance 

 to P. dentata^ Brongt., but the plant is more iinely cut and 

 slender, while the decurrent pinnules and winged rachis are 

 not found in P. dentata. It has a strong resemblance to 

 Pacliypteris, Brongt. 



Habitat. — Roof shales of the Waynesburg Coal, Cassville, 

 West Virginia. 



Pecopteris angustipinna, Sp. nov., PL XXVII, Figs. 1-3. 



(Frond, tripinnate ; primary pinnae, triangular in outline ; 

 primary racliis strong and arborescent ; secondary pinnae, 

 elongate-linear, narrow, alternate and thickly set ; second- 

 ary rachis stout and rigid ; pinnules ovate-obtuse, slightly 

 inclined forward or falcate, united at the base, the amount 

 of union increasing toward the summit of the frond ; pa- 

 renchyma dense and leather-like ; basal pinnule on the 

 lower side, often partly inserted on the primary rachis ; 

 mid-nerve well defined ; lateral nerves going off at an acute 

 angle and forked.) 



