The species hitherto named are as follows:
PTERANODON.
Pteranodon Marsh, Amer. Journ. Sci. xi, p. 508, June 1876; and xii, p. 479, Dec. 1876; xxiii, p. 253, April, 1882; xxvii, p. 423, May, 1881; Williston, Amer. Naturalist, xxv, p. 1174, Dec. 1891
Pteranodon occidentalis.
Pterodactylus Oweni Marsh, Amer. Journ. Sci. i, p. 472, June 1871, Sep. p. 16 (nom. preoc).
Pterodactylus occidentalis Marsh, Amer. Journ. Sci. iii, p. 242, April 1872, Sep. p. 1; Cope, Cretac. Vert. p. 68, pl. vii, ff. 5, 6.
Ornithocheirus harpyia Cope, Proc. Amer. Phil. Soc. 1872, p. 471 (Cope).
This species was originally based upon the distal end of two wing-metacarpals, and teeth. In the following year, a fuller description was given of additional remains referred to the same species and renamed P. occidentalis.
Pteranodon ingens.
Pterodactylus ingens Marsh, Amer. Journ Sci. iii, p. 246, April 1872, Sep. p. 6.