Pteranodon longiceps Marsh, Amer. Journ. Sci. xi, p. 508, June 1875; xxvii, p. 424, pl. xv, May 1884.
Based upon a somewhat defective skull, without other bones. There is no evidence whatever that the species is distinct from the preceding.
Pteranodon comptus.
Pteranodon comptus Marsh, Amer. Journ. Sci. xi, p. 509, June 1876.
Based upon wing-bones of three individuals. The description is meagre.
Pteranodon nanus.
Pteranodon nanus Marsh, Amer. Journ. Sci. xxi, p. 343, April 1881.
Based upon various remains of one individual; the humerus, alone, is recognizably described.