EXPLANATION OF PLATES VI-X. 



Plate VI. 



Figs. 1, 2. Equisetum gloiulosmn, sp. nov., p. 444. 



Figs. 3, 4, 5, 6. Osmunda Torelli, Heer., p. 444. 



Figs. 7, 8, 9. Thuites {ChamcBcyparis) Alaskensis, sp. nov., p. 445. 



Figs. 10, 11, 12. Comptonia ciispidata, sp. nov., p. 445. 



Fig. 13. Comptonia proemissa, sj). nov. , p. 445. 



Fig. 14. Betula Alaskana, sp. nov., p. 446. 



Plate VII. 



Figs. 1, 2, 3, 4. Alnus corylifoUa, sp. nov., p. 446. 

 Figs. 5, 6. Carpinus grandis, Ung., p. 446. 



Plate VIII. 



Fig. 1. Fagus Dencalionis, Ung., p. 446. 

 Figs. 2, 3, 4, 5. Quercus Dallii, sp. nov., p. 446, 

 Fig. 6. Salix Eaeana, Heer., p. 447. 



Plate IX. 



Fig. I. Populus Eichardsoni, Heer., p. 447. 

 Fig. 2. Populus arctica, Heer., p. 447. 

 Fig. 3. Ulmus sorUfoUa, Ung., p. 447. 

 Fig. 4. Elceodendron Helveticum, Heer., p. 449. 



Plate X. 



Figs. 1, 2. Diospyros anceps, Heer.. p. 448. 



Figs. 3, 4, 5. Vaccinium reticulatum, Al, Br., .p. 448. 



Fig. 6. Comus orhifera, Heer., p. 448. 



Figs. 7, 8, 9. Magnolia NordensUoldi, Heer., p. 448. 



fProc. Nat. Mn8., 1882.] 



