knowlton.] TERTIARY PLANTS OF NORTH AMERICA. 79 
Ctenopteris longifolia Font. Potomac Fl., p. 159, pi. lxvii, f. 5, 1889. 
Potomac formation : Fredericksburg, Virginia. 
Ctenopteris minor Font. Potomac Fl., p. 157, pi. lxvii, f. 3, 1889. 
Potomac formation : Fredericksburg, Virginia. 
Ctenopteris virginiensis Font. Potomac Fl., p. 157, pi. lxii, f. 4; lxv, 
f. 1; lxvi, f. 4, 1889. 
Potomac formation : Fredericksburg, Virginia. 
CUNNINGHAMITES Presl. In Sternb., Vers., vol. ii, p. 203, 1833. 
Cunninghamites elegans (Oorda) Endl. Synop. Conif., p. 305, 1847 ; 
Newby., Fl. Amboy Clays, p. 48, pi. v, f. 1-7, 1895 [1896]. 
Amboy clay : Keyport, New Jersey. 
Clay marl (Upper Cretaceous) : Cliffwood, New Jersey. 
Cunninghamites squamosus Heer. Kreide Fl. v. Quedlinburg, p. 9, 
pi. i, f. 5-7, 1872; Hollick, Trans. N. Y. Acad. Sci., vol. xvi, p. 129, 
pi. xi, f. 3, 1897. 
Clay marl (Upper Cretaceous) : Cliifwood, New Jersey. 
CUPRESSINOXYLON Goppert. Monogr. d. foss. Conif., p. 196, 
1850. 
Cupressinoxylon arkansanum Kn. Ann. Eept. Geol. Surv. of Ark. 
for 1889, vol. ii, p. 253, pi. ix, f. 1, 2, 1889. 
Tertiary [Orange Sand] : Near Wittsburg, Cross County, Arkansas. 
Cupressinoxylon Calli Kn. Ann. Eept. Geol. Surv. of Ark. for 1889, 
vol. ii, p. 254, pi. ix, f. 3-7, 1889. 
Tertiary: 5J miles northwest of Gainesville, Green County, 
Arkansas. 
Cupressinoxylon? Bibbinsi Kn. Science, new ser., vol. iii, no. 68, 
p. 584, f. (in text) 1-4, 1896. 
Upper Potomac formation : Cape Sable, Maryland. 
Cupressinoxylon columbianum Kn. Bull. U. S. Geol. Surv., no. 56, 
p. 49, pi. iv, f. 5; pi. v, f. 3, 4; pi. vi, f. 1-5; pi. vii, f. 1, 1888. 
Potomac formation: Dutch Gap Canal, James River, Virginia. 
Cupressinoxylon dubium Cramer. In Heer's, Fl. Foss. Arct., vol i, p. 
173, pi. xxxiv, f. 3; xxxviii, f. 1-6, 1868. 
: Banks Land. 
Cupressinoxylon elongatum Kn. Proc. U. S. Nat. Mus., vol. xi, p. 
7, pi. iii, f. 1-4, 1888. 
Fort Union group : Near Glendive, Montana. 
Cupressinoxylon eutreton Felix. Zeitschr. d. Deutscheu geol. Gesell. 
Jahr. 1896, p. 255, 1896. 
Eocene: Yanceys, Yellowstone National Park. 
Cupressinoxylon G-lasgowi Kn. Proc. U. S. Nat. Mus., vol. xi, p. 
6, pi. ii, f. 1-5, 1888. 
Cretaceous!: Emmet County, Iowa. 
Cupressinoxylon McG-eei Kn. Bull. U. S. Geol. Surv., no. 56, p. 46, 
pi. ii, f. 5; pi. iii, f. 1-5, 1888. 
Potomac formation: Washington, District of Columbia. 
