154 CATALOGUE OF THE CRETACEOUS AND [bull. 152. 
ONYCHIOPSIS Yokoyama. Journ. Col. Sci. Japan, vol. iii, p. 26, 
1890. 
Onychiopsis Mantelli (Brongn.) Seward. Wealden FL, p. 41, 1894. 
Sphenopteris Mantelli Brongn. Prod. Hist. Veg. Foss., p. 50, 1828; Hist. Veg. 
Foss., p. 170, 1828; Font., Potomac FL, p. 91, pi. 1, f. 1, 2, 1889. 
Potomac formation : Baltimore, Maryland. 
OPEG-RAPHA Perspon in listed n. Ann., 1., p. 23, 1794. 
Opegraphaantiqua Lx. Ann. Eept. U. S. Geol. andGeogr. Surv. Terr., 
p, 390, 1872 [1873] ; Tert. Fl., p. 36, pi. i, f. 1-lc, 1878. 
Laramie group : Black Buttes, Wyoming. 
OPHIOG-LOSSUM (Tournefort) Linnajus. Gen. PI., p. 332, 1737. 
Opliioglossum Alleni Lx.=Tmesipteris Alleui. 
Ophioglossum granulatum Heer. Fl. Foss. Arct., vol. vii, p. 8, pi. 
ivii, f. 8, 9, 1883; Fl. Amboy Clays, p. 43, pi. ix, f. 11-13, 1895 (1896). 
Amboy clay: No locality given. 
OREODAPHNE Nees and Martius. Ex Nees in Linnaea, vol. viii, 
p. 39, 1833. 
Oreodaphne cretacea Lx. Cret. Fl., p. 84, pi. xxx, f. 5, 1874. 
Dakota group : Kansas. 
Oreodaphne Heerii Gaud. Neue Denkschr. Sclrw. Gesel., vol. xvi, 
p. 35, 1858; Lx., Proc. U. S. Nat. Mus., vol. xi, p. 30, 1888. 
Eocene: Lassen County, California. 
Oreodaphne lith(s)seformis Lx. Proc. U. S. Nat. Mus., vol. xi, p. 30, pi. 
xiv, f. 4, 1888. 
Eocene?: Lassen County, California. 
OREODOXITES Goppert. Foss. Fl. d. Perm. Form., p. 146, 1864. 
Oreodoxites plicalus Lx. Cret. and Tert. Fl., p. 122, pi. xviii, f. 1-4, 
1883. 
Denver group : Golden, Colorado. 
ORYZOPSIS Michaux. Fl. Bor. Am., vol. i, p. 51, 1803. 
Oryzopsis asperifolia Mx. Penkallow, Bull. Geol. Soc. Am., vol. i, 
p. 331, 1890. 
Pleistocene: Greens Creek, Ottawa River, Canada. 
OSMUNDA Linngeus. Gen. PL, p. 322, 1737. 
Osmunda affinis Lx. Tert. FL, p. 60, pi. iv, f. 1, 1878. 
Pteris affinis Lx. Ann. Rept. U. S. Geol. and Geogr. Surv. Terr., p. 392, 1873 
[1874]. 
Peteris anceps Lx. Ann. Rept., op. eit., p. 376, 1872 [1873]. 
Denver group: Golden, Colorado. 
Osmunda dicksonioides Font. Potomac Fl., p. 146, pi. xli, f. 5; lviii, 
f. 9; lix, f. 1, 4, 8, 9, 11; lx, f. 2, 4, 5, 9; lxi, f. 1, 2, 1889. 
Potomac formation : Near Potomac Run, Virginia. 
Kootanie: Great Falls, Montana. 
Knoxville beds: Tehama County, California. 
