348 



A CONTRIBUTION TO THE KNOWLEDGE OP 



published cither description or figure, I give a figure of an Amudaria* from the coal-fields 

 of Western Virginia, to which the name may be applied. The Academy is indebted to 

 Dr. Dixon for it. 



Gen. Sphenopteris. 



S. pterota, N. Sp. Frond bipinnatc'?; pinna; nearly linear; pinnules alternate, varying 

 from short triangular and roundish oval to elongate oval, approximate, joined by their 

 decurrent bases, their margins crenulate ; the proximal pair with their bases decurrent 

 on the main rachis, which is alate; the medial nerve rather thick and strongly pro- 

 nounced; the nervules obsolete; stem and also rachis of the pinnules strongly striate. 



I have seen but a single small specimen from the coal-fields of Western Virginia ; it 

 appears as though the plant was tripinnate, and what I have called the stem was the 

 rachis of a primary pinna. The plant has some affinities with S. rnicroloba, Gutb., but is 

 evidently distinct from it. 



Museum of the Academy, Dr. Dixon. 



Gen. Ctclopteris. 

 C. fimbriata, Lesq. 

 C. Wilsonii, Wood. 



Proc. A. N. S., vol. xii, 1860, p. 519. 



Gen. Odontopteris. 



O. rotundifolia, N. Sp. Pinnaa small, somewhat lanceolate ; pinnules small, rather 

 distant, irregularly orbicular, or roundish oval ; nervation very indistinct ; terminal pinnule 

 irregularly oval, somewhat wedge-shape at the base, lobed on one side near the middle. 



Cabinet of the Academy, D. II. Bennett. 



O. Lescurii, N. Sp. Frond bipinnatc 1 ; pinnules alternate, varying from broadly ovate 

 to elongate-ovate, suddenly and very greatly contracted at their base, mostly very obtuse ; 

 nervules dichotomously forking, pronounced, rather distant, a number arising from 

 the base, but the central frequently heavier than the rest, and giving off more numer- 

 ous secondary nervules, so as to present somewhat of the appearance of a midrib ; rachis 

 smooth. 



The form of the pinnules varies very greatly in this as in all our species of the 

 genus ; the upper very small ones are somewhat spatulatc, whilst some of the lower are 



* Prof. Lcsqucreux informs mo that it is the same species as the plant found by him in the Gates vein, Potts- 

 yille, and mentioned by him in his Catalogue under the name of A. minuta, Br. 



