PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 503 



1. Equisbtum OREGONENSE, D. sp. 



Stem robust, 3 ceutimeters wide ; longitudinal flutings numerous, 

 about 24 in a half-circumference ; joints' 5 centimeters distant; teeth 

 triangular, short. 



Formation and locality. — Miocene? Tertiary beds, Cnrrant Creek, 

 Oregon. Collected by Prof. Thos. Condon. 



2. Lastrea (Goniopteris) Knightiana, n. sp. 



Frond large, tripinnate; pinnae linear, 2 centimeters wide, 14 to 16 

 centimeters long; pinnules diverging at a large angle, united for two- 

 thirds of their length, upper third free, pointed and curved upward; 

 venation clear and.cxact, midrib reaching the extremity of the pinnule; 

 the lateral nerves about ten on either side, parallel, curved upward. 



Formation and Zocaii^?/.— Tertiary strata. Currant Creek, Oregon,where 

 it occurs matted together in masses. Collected by Prof. Thomas 

 Condon. 



3. ACROSTIGHUM HESPERIUM, n. Sp. 



Frond large, pinnate; pinnae linear, 1| to 2 inches wide, 6 to 12 inches 

 long, rounded at remote extremity, those in lower part of frond rounded 

 or wedge-shaped at base, those above united by the entire base to the 

 rachis and with each other; rachis of frond and midrib of pinnae strong, 

 smooth, somev, hat sinuous ; nervation reticulated, lateral nerves numer- 

 ous, diverging from the midrib at an acute angle, anastomosing to form 

 elongated six-angled areoles; fructification unknown. 



Formation and locality. — l^oceua Tertiary, Green Ptiver, Wyoming. 

 Collected by Dr. C. A. White. 



4. Pteris elegans, n. sp. 



Pinnae linear, 25 millimeters wide; nervation remarkably strong and 

 uniform; lateral nerves springing from the midrib at an angle of 45°, 

 simple, strong, parallel from midrib to margin. 



Formation and locality.— TeTthiry strata, Currant Creek, Oregon. 

 Collected by Prof. Thomas Condon. 



5. Pteris Eussellii, n. sp. 



Frond large, pinnate; pinnae crowded, linear in outline, narrow, long- 

 pointed above, attached to rachis by entire base; decurrent; length 

 16 to 20 centimeters ; width 10 millimeters ; margins undulate, irregularly- 

 toothed; nervation fine, but distinct; branches leaving midrib at an 

 angle of about 45^, all twice or three times forked. 



Formation and locality.— lji\Yi\m\e Group, Vermejo Caiion, X. Mex. 

 Collected by Mr. I. C. Eussell. 



6. Pecopteris (Phegopteris) sepulta, n. sp. 



Frond small, delicate, pinnate ; lower pinnae straight ; broadly linear 

 in outline, rounded above, attached to rachis, by the whole' breadth of 



