418 Lesquereux's Descriptions of 



nate ; pinnae lanceolate, short, pinnules oblong, attached to 

 the broad flattened rachis by their whole base and slightly 

 decurrent, distinct; nervules distinct, flabellate, dichotomous, 

 arched, thin, and close ; rachis slightly winged, flexuous. 



24. Neuropteris gibbosa (spec. nov.). Frond bipin- 

 nate ; pinnules opposite, nearly equally cordate at the base, 

 oblong obtuse, with the margins deeply and irregularly sinu- 

 ate ; nervules flabellate, dichotomous, very slender, close and 

 distinct. 



25. Neuropteris undans (spec. nov.). Frond bipin- 

 nate ; pinnules either large, two inches long and more, lance- 

 olate, attenuate at the base, with the margins deeply undulate 

 plaited, or small oblong undulate, with a very large (three 

 times longer and broader) terminal lance-shaped, obtuse, 

 undulate pinnule, lobate or angular below the middle ; 

 nerves flabellate, very arched, dichotomous, very thin and 

 close on the margin ; inflated at and near the base. 



26. Neuropteris tenuinervis (spec. nov.). Frond bipin- 

 nate ; pinnules oval or oblong, with undulate margins, some- 

 times irregularly toothed at the summit ; either regularly 

 cordate at the base, or attenuated in a short broad petiole ; 

 nervules very thin, dichotomous from the base, slightly 

 arched or straight, equal, not inflated below ; medial nerve 

 marked by a very thin exactly straight depression ; rachis 

 round and narrowly striate. 



27. Neuropteris dentata (spec. nov.). Frond pinnate; 

 pinnules slightly cordate, at the base oval, lanceolate in out- 

 line, with the margins irregularly cut ; toothed and lobed ; 

 nerves flabellate and dichotomous, deeply marked but very 

 thin and close. 



28. Neuropteris Desorii (spec. nov.). Frond bipinnate ; 

 pinnules opposite, either oblong oval, or obovate, entire, or 

 irregularly laciniate from the base, sometimes pinnately divided 

 in long linear teeth ; nerves flabellate, dichotomous, very thin 

 above, thickened at the base. 



29. Neuropteris minor (spec. nov.). Frond bipinnate; 



