182 CATALOGUE OF THE CRETACEOUS AND [bull. 152. 
PORANA Burm. f. Fl. Ired., p. 51, 1768. 
Porana Bendirei (Ward) Lx. Proc. U. S. Nat. Mus., vol. xi, p. 10 pi. 
viii, f. 4, 1888. 
Marsilea Bendirei Ward. Fifth Ann. Rept. U. S. Geol. Snrv., p. 446, 1883-84 
[1885]. 
Miocene: John Day Valley, Oregon. 
Porana Speirii Lx. Cret. and Tert. El., p. 172, pi. xxviii, f. 15, 1883. 
Green River group : Florissant, Colorado. 
Porana tenuis Lx. Cret. and Tert. Fl., p. 173, 188;;. 
Green River group : Florissant, Colorado. 
Porana sp., Lx. Proc. U. S. Nat. Mus., vol. xi, p. 13, 1888. 
Eolignitic: Wickliffe, Kentucky. 
POTAMOGETON (Tournefort) Linnaeus. Syst. ed., i, 1735. 
Potamogeton geniculatus Al. Br. Neues Jahrb. 1815, p. 168, 1845; 
Lx., Cret. and Tert. Fl., p. 142, 1883. 
Green River group: Florissant, Colorado. 
Potamogeton pectinatus L. Sp. PL, p. 127, 1753; Penh allow, Trans. 
Roy. Soc, Canada, 2d ser., vol. ii, sec. iv, p. 6(j, 72, 1896. 
Pleistocene: Besserer's Wharf, Ottawa River. 
Potamogeton perfoiiatus L. Sp. PL, p. 126, 1753; Dii., Can. Nat., 
vol. iii, new ser., p. 72, 1868; Geol. Hist. PL, p. 229, 1888; Penhallow, 
Trans. Roy. Soc. Canada, 2d ser., vol. ii, sec. iv, p. 65, 72, 1896. 
Pleistocene: Besserer's Wharf and Greens Creek, Ottawa River 
Canada. 
Potamogeton pusillus L. Sp. PL, p. 127, 1753; Dn., Can. Nat., vol. 
iii, new ser., p. 73, 1S6S; Geol. Hist, PL, p. 229, 1888; Penhallow, 
Trans. Roy. Soc. Canada, 2d ser., vol. ii, sec. iv, p. 65, 72, 1896. 
Pleistocene: Besserer's Wharf and Greens Creek, Ottawa River, 
Canada, 
Potamogeton rutilans Wolfg. Penh allow = Potamogeton rutilus. 
Potamogeton rutilus W^olfg. 
Potamogeton rutilans? Wolfg. Penhallow, Bull. Geol. Soc. Am., vol. i, p. 327, 
1890; Trans. Roy. Soc. Canada, 2d ser., vol. ii, sec. iv, p. 65, 72, 1896. 
Pleistocene: Besserer's Wharf and Greens Creek, Ottawa River. 
Potamogeton Robbinsii Oakes. Hovey's Mag., vol. vii, p. 180, 1841 ; 
Kn., Am. Geol., vol. xviii, p. 371, 1896. 
Glacial: Morgantown, West Virginia. 
Potamogeton? verticillatus Lx. Cret. and Tert. FL, p. 142, pi. xxiii, 
f. 5, 6, 1883. 
Green River group : Florissant, Colorado. 
POTENTILLA Linnaeus. Syst., ed. i, 1735. 
Potentilla anserina L. Penhallow, Bull. Geol. Soc. Am., vol. i, p. 330, 
1890; Trans. Roy. Soc. Canada, 2d ser., vol. ii, sec.iv, p. (jC), 73, 1896. 
Potentilla norvegicaL. Dn., Can. Nat., vol. ii, p. 422, 1857. 
Potentilla canadensis L. Dn., loc. cit., new ser., vol. iii, p. 71, 1868. 
Potentilla simplex? Michx. Dn., Geol. Hist. PL, p. 228, 1888. 
Pleistocene: Greens Creek and Besserers Wharf, Ottawa River, 
Canada. 
