78 CATALOGUE OF THE CRETACEOUS AND [bull. 152. 
Crataegus Lacoei Lx. Fl. Dak. Gr., p. 143, pi. Ixiv, f. 14. 1892. 
Dakota group : Kansas. 
Crataegus lawrenciana Lx. Fl. Dak. Gr., p. 142, pi. xxxviii, f. 1, 1892. 
Dakota group : Kansas. 
Crataegus Marcouiana Lx. Proc. U. S. Nat. Mus., vol. xi, p. 36, pi. 
xiv, f. 2; pi. xv, f. 1, 2, 1888. 
Unknown: "Fossil Point, P. Y. Sheet." 
Crataegus Marcouiana subintegrifolia Lx. Proc. U. S. Nat Mus., 
vol. xi, p. 36, pi. xiv, f. 2, 1888. 
Unknown: "Fossil Point, P. Y. Sheet." 
Crataegus myricoides Lx. Bull. Mus. Comp. Zool., vol. xvi, p. 56, 1888. 
Denver group: Golden, Colorado. 
Crataegus tenuinervis Lx. Fl. Dak. Gr., p. 142, pi. liv, f. 5-7, 1892. 
Dakota group: Kansas. 
CREDNERIA Zenker. Beitrage z. Naturgeschichte der Urwelt, 
p. 15, 1833. 
? Credneria daturaefolia Ward. Bull. U. S. Geol. Surv., no. 37, p. 97, 
pis. xlii, f. 4; xliii, xliv, xiv, 1887. 
Fort Union group : Seven-Mile Creek, Montana. 
Credneria Leconteana Lx. = Protophyllum Leconteanum. 
Credneria ? microphylla Lx. Bull. U. S. Geol. and Geogr. Surv. Terr., 
vol. i, p. 397, 1875 [1876]. 
Dakota group : Kansas. 
CTENIS, Lindley and Hutton. Foss Fl. Great Britain, vol. ii, p. 63, 
1834. 
Ctenis imbricata Font. Potomac Fl., p. 177, pi. cxxxviii, f. 10-12,1889. 
Potomac formation : Fredericksburg, Virginia. 
CTENOPHYLLUM Schimper. Pal. Veg., vol. ii, p. 143, 1870. 
Ctenophyllum latifolium Font. Potomac Fl., p. 175, pi. lxviii, f. 2, 3, 
1889. 
Potomac formation : Fredericksburg, Virginia. 
CTENOPTERIS Brongniart, in litt. Saporta. Plantes Jurassiques, 
vol. i, p. 351, 1873. 
Ctenopteris angustifolia Font. Potomac Fl., p. 159, pi. lxv, f. 2 ; lxvii, 
f. 4, 1889. 
Potomac formation: Near Potomac Eun, Virginia. 
Ctenopteris insignis Font. Potomac Fl., p. 156, pi. lxi, f. 4, 5; lxii, 
f. 1; lxiii, f. 1,2,1889. 
Potomac formation: Fredericksburg, and near Potomac Run, 
Virginia. 
Ctenopteris integrifolia Font. Potomac Fl., p. 158, pi. lxii, f. 2; lxv, 
f. 3, 1889. 
Potomac formation: Near Potomac Ruu, and Fredericksburg, 
Virginia. 
