FEENS— PECOPTEBIS— BEITTSIA. 97 



From the closely resemblant species Sphenopteris integra, as fig-ured iu 

 Germar's "Versteinerungen,"^ our species is distinguished by the more open 

 divisions, the pinnules usually not curved so much upward, with bases not 

 so rhombic, while the midrib is not so slender or flexuous. 



Localities. — Hobbs's coal bank, U. S. Nat. Mus., 5730, 5732, 5737, 

 5751?; Pitcher's coal bank, U. S. Nat. Mus., 5505, 5506, 5729, 6733, 5735, 

 57501; (3wen's coal bank, U. S. Nat. Mus., 5608?, 5728, 5731, 5734; 

 Henry County, Missouri, U. S. Nat. Mus., 5823. 



Pecopteeis sp. iuclet. 



Among- the obscure and specificalh' indeterminate Pecopteroid frag- 

 ments are two specimens showing a delicate, translucent, oblique pinnuled 

 plant, somewhat suggestive of some of the unillustrated examples from 

 Mazon Creek, Illinois, referred by Professor Lesquereux to Pecopteris ser- 

 piUifolia. The Missouri form has, however, the sides of the pinnules more 

 nearly parallel and the nervils more open and forking once in the larg-er 

 pinnules. 



The material appears insufficient to justify an attempt at a more com- 

 plete description or comparison. 



Locality. — Owen's coal mine, U. S. Nat. Mus., 5601, 5602. 



Pecoptekis mertbnsides Lx. MSS. 



Another new species of Pecopteris was distinguished and described by 

 Professor Lesquereux in manuscript, which it is hoped may be published a.t 

 an early date. The quotation of the nomen nudum in this place is sufficient 

 to indicate the presence in our flora of this species, which was named Pecop- 

 teris mertensides. 



Loccdity. — Hemy County, Missouri, No. 4869 of the Lacoe collection, 

 U. S. Nat. Mus. 



IlSrCERT.E SEDIS. 



BEITTSIA gen. nov. 



Frond (?) consisting of broad, pinnate, dilate, palmate-open, lax-nerved, 

 somewhat fleshy expansions of the rachial lamina, on the upper surface of 

 which are placed the more or less distinctly imbricated pinnules. Tvpe, 

 Brittsia problematica. 



' Page 67, pi. sxviii, figs. 1-4. 

 MON XXXVII 7 



