94 CATALOGUE OF THE CRETACEOUS AND [bull. 152. 
ENCEPHALARTOPSIS Fontaine. Potomac Fl., p. 174, 1 889. 
Encephalartopsis nervosa Font. Potomac FL, p. 174, pi. lxx, f. 4; 
lxxi, f. 3, 4; lxxii, f. 3, 4, 1889. 
Potomac formation : Fredericksburg, Virginia. 
ENCEPHALARTOS Lehman. Pugill., vol. vi, p. 3, 1834. 
Encephalartos cretaceus Lx. Fl. Dak. Gr., p. 29, pi. i, f. 12, 1891. 
Dakota group : Kansas. 
ENG-ELHARDTIA Leschen. In Blume, Bijdr., 528, 1825. 
Engelhardtia oxyptera Sap. Etudes (Ann. d. Sci. Nat., 5th ser., Bot., 
vol. 4), p. 344, pi. xii, f. 2, 1865; Lx., Oret. and Tert. Fl., p. 192, 1883. 
Green River group : Florissant, Colorado. 
EQUISETUM (Tournefort) Linna?us. Gen. PL, p. 322, 1737. 
Equisetum arvense L. Knowlton, Am. GeoL, vol. xviii, p. 371, 1896. 
Glacial : Morgantown, West Virginia. 
Equisetum globulosum Lx. Proc. U. S. Nat. Mus., vol. v, p. 444, 1882 
[1883] ; Cret. and Tert. FL, p. 222, pi. xlviii, f. 3, 1883. 
Eocene?: Alaska. 
Fort Union group : Bad Lands, Dakota. 
Equisetum Haydenii Lx. Ann. Rept. U. S. GeoL and Geogr. Surv. 
Terr., p. 284, 1871 [1872] ; Tert. FL, p. 67, pi. vi, f. 2-4, 1878. 
Green River group: Barrell Springs, Wyoming. 
Denver group ? : Carbon, Wyoming. 
Equisetum Hornii Lx. Proc. U. S. Nat. Mus., vol. xi, p. 23, 1888. 
Eocene?: Cherry Creek, Oregon. 
Equisetum leevigatum Lx. Tert. FL, p. 6S y pi. vi, f. 6, 7, 1878. 
Equisetum? leevigatum Lx. Anu. Rept. U. S. Geol. and Geogr. Surv. Terr., p. 
395,1873 [1874]. 
Laramie group : Golden and Sand Creek, Colorado. 
Equisetum Lesquereuxii nom. nov. 
Equisetum limosum ? L.* Lesquereux, Ann. Rept. U. S. Geol. and Geogr. 
Surv. Terr., p. 299, 1871 [1872] ; Tert. FL, p. 69, pi. vi, f. 5, 1878. [* Not the 
living E. limosum!'] 
Miocene?: Yellowstone National Park. 
Equisetum limosum L. Penhallow, Bull. GeoL Soc. Am., vol. i, p. 
327, 1890; Trans. Roy. Soc. Canada, 2d ser., vol. ii, sec. iv, p. 66, 71, 
1896. 
Pleistocene: Greens Creek and Besserer's Wharf, Ottawa River. 
Equisetum limosum'? L. Lx. = Equisetum Lesquereuxii. 
Equisetum Lyelli Mantell. GeoL S. E. England 1833, p. 217, 1833; 
Font., Potomac FL, p. 65, pi. i, f. 7; pi. ii, f. 4, 5, 1889; Dn., Trans. 
Roy. Soc. Canada, vol. x, sec. iv, p. 83, f. 1, 1892 [1893]. 
Potomac formation: Fredricksburg and Dutch Gap Canal, Vir- 
ginia. 
Kootanie: Canada. 
