No. 3. — Specimens of Fossil Plants collected at Golden, Colorado, 

 1883, for the Museum of Comparative Zoology at Cambridge, 

 Mass., examined and determined by Leo Lesquereux. 



[Returned to the Museum, July 17, 1884.*j 



CRYPTOGAMOUS PLANTS. 

 Lycopodiaceae. 



1. Selaginella Berthoudi, Lx. 2 specimens. 



Filicaceae. 



2. Sphenopteris Lakesii, Lx. 62 specimens. 



3. Sphenopteris membranacea, Lx. 2 specimens. 



4. Hymenophijllites confmus, Lx. 5 specimens. 



5. Ptcris pseudopennceformis, hx. 2 specimens. 



6. Pteris suhsimplex, Lx. 20 specimens. 



7. Pteris erosa, Lx. 1 specimen. 



8. Pteris undulata, sp. nov. Leaves large, linear-lanceolate, regularly deeply 

 nndulate-crenate especially in the upper part; secondaries thin, distant, de- 

 clined in joining the rachis, open in passing toward the borders; forking once 

 at base, sometimes once again near the borders, very distinct. 



Much like P. suhsimplex, Lx., U. S. Geol. Surv. of the Terr., VIL p. 52, PI. 

 TV. tig. 5; but with the secondaries thinner and the borders undulate. The 

 leaves, about 12 cm. long, 3^ cm. broad, are coriaceous with polished surface. 

 The angle of divergence of the veins is more acute, 45? to 50°, and their dis- 

 tance 1^ mm. 2 specimens. 



9. Woodxoardia latiloba, Lx. 53 specimens. 



10. Gymnogramma Haydenii, Lx. 8 specimens. 



Equisetaceae. 



11. Physagenia, species. Tubercles attached to filaments diverging in rows 

 from a central point, composing the rhizoma of some Equisetacece. Central 

 point exactly round, 2 mm. in diameter; tubercles oval, 12 mm. long, 6 mm, 

 broad in the mitldle, strangled to 2 mm. at the point of union, and forming a 

 chain of which two of the tubercles are seen in chjse connection. They are 



* The manuscript of this memoir, as it was delivered in 1884, is copied without 

 any correction. — Editob. 



VOL. XVI. — NO. 3. 



